Coil wrap calculator

Coil Wrap Calculator

Welcome to Vaping Hardware’s Coil Wrap Calculator!

Experimenting with a double, triple or quad coil build? Itching to try a parallel, twisted or even flat ribbon coil? Whatever build you’re after, our Coil Wrap Calculator has you covered!

If you’re completely new to the world of DIY coil building then you might want to take a look at our coil building and coil wicking tutorials.

We’ve also included a few frequently asked questions at the bottom of the page.

Happy Building!


Wire Type
Wire Profile
Build Deck Configuration
AWG ()
Inner Coil Diameter   mm ()
Target Resistance   Ω
Tail Lead Length (total)   mm


Number of Wraps
Rounded to Full Wraps
Rounded to Half Wraps
Wire Length
Resistance of Each Coil
Resistance of Build Deck
Surface Area of Coil
Current Drain from Battery
Vaping Power @ 4.2V


A typical coil build resistance usually ranges from around 0.1ohms to 2.5ohms.

However, this is always dependent on the mod and/or tank you’re using. It’s important you stick within the safe range your device can handle!

Personally, we think a great starting range would be something like 0.5ohms to 1ohm. Anything on that scale should give you great flavor and vapor! As long as you know how to wick properly of course…

Although you don’t actually NEED that much to build a coil, there are literally dozens of tools, supplies and gadgets we could list here!

In terms of the basics, you’ll need a length of resistance wire, a screwdriver ( or drill bit!) and a pair of cutters. Quick tip though; a good pair of clean nail clippers work just as well!

Needle nose pliers (or tweezers in a pinch) are also important to shape your coil after you’ve installed it.

Finally, you might also need a metre to test your Ohms, although most mods will tell you the coil resistance.

To make life easier, there are plenty of coil building kits available with everything you could need and then some! We really recommend this one here from Amazon, it’s a great kit at a really decent price.

This depends completely on what type of coil you’re building, your target resistance and even how much flavor you want from your coil.

We’d usually suggest sticking to around 6 wraps as this will give you a good cross sectional surface area with decent flavor.

Ultimately it’s down to personal preference, just experiment to see what works best for you.

The macro coil is any type of coil with an inner diameter larger than 2mm.

This micro coil is any type of coil with an inner diameter of less than 2mm.

Both Macro and Micro are forms of ‘contact’ coils, which basically mean they’re tightly wrapped, with each coil wrap touching those on either side of it.

As opposed to a ‘spaced’ coil which is exactly what it sounds like; the vape coil wraps are spaced evenly with a slight gap between each.

As the name suggests, this is simply a coil placed flat on your build deck, running between the deck posts.

Some people now consider this ‘old hat’ as the popularity of vertical coils has increased.

However, this method was the standard back in the early days of DIY vape coil building and is a design we still use to this day.

Personally, we prefer this method as we notice less ‘spitback’ from these when compared with vertical coils.

Choosing between vertical and horizontal coils will often depend on your atomiser, the position and shape of your air holes and the layout of the build deck.

The norm for stock coils, this is basically a standing coil situated in the centre of your build deck reaching toward the top of your atomiser.

The vertical coil can be wicked on either the inside or outside, which is more commonly known as a ‘chimney’ coil.

These coils have gained popularity, due to the improved airflow and flavor as more of the coil surface area is in contact with the wick.

A half wrap refers to the coil legs pointing in the same direction.

A full wrap refers to the coil legs pointing in opposite directions.

As with any coil you build, it’s always vital that you test it before you fire it.

Use an Ohm reader to make sure that the resistance is roughly where you want it. This should help prevent any nasty surprises or a ‘short’ when you fire the mod for the first time.

This is never more important than when using an unregulated mod (Mechanical), a direct short to ground/earth could be dangerous.

We don’t have an option for making Clapton coils just yet but this is coming soon! In the meantime, we do have a ‘workaround’ that will work just as well…

The outer wrap of a Clapton is fairly insignificant with respect to the core wrap in terms of resistance. By inputting just the core wire profile and AWG you’ll be getting a roughly similar result.

Likewise, for a Fused Clapton which has two cores and an outer wrap, input the two core wire profiles and AWG by selecting ‘Round Parallel 2 Strand’. Although not exact, this will give you the approximate info you need!

Yes, our calculator will work out the required wraps for any type of wire. Simply select ‘Custom’ and the menu will change allowing you to input the wire diameter and resistance per meter of your specific wire type. This information can often be found on the wire wheel or manufacturer’s specifications.

This is the power your mod will produce based on the coil you’ve built. However, it’s really only useful when using an unregulated mod (mechanical) on a fully charged battery (4.2V). If you’re using a regulated mod you can select whatever power you want via the wattage settings on your device.

Kanthal A1 and Nichrome N80 are the two types of wire used for Variable Wattage mode only. Stainless Steel (316) can be used in either Variable Wattage or Temperature Control (TC) mode.

Nickel NI200 and Titanium wire can both be used in Temperature Control mode. Stainless Steel (316) can be used in either Temperature Control or Variable Wattage mode.

This is the current being drained from your battery based on the coil you’ve built.  However, it’s really only useful when you’re using an unregulated mod (mechanical) on a fully charged battery (4.2V). If you’re using a regulated mod you can check the correct battery current drain using our Battery Amp Draw/Drain Calculator.

Basically this is just the size of the ‘inside’ of your coil.  To wrap a coil, you’ll need either a drill bit, a screwdriver or (ideally!) a coil jig to wrap the wire around. The size of whatever you use dictates the inner coil diameter.

When you wind your coil, this is the ‘clipped’ length of the open straight ends of the coil that are inserted into the deck posts of your tank. They should be kept to a minimum. The tail lead length is the total length of the two ends.

Target resistance is the resistance you want your coil/deck to be. Build deck configuration is how many coils you want to place into the deck. If your building for a single deck/coil then select single and specify what you want your resistance to be. If you’re building a dual coil/deck configuration, then select dual and specify the overall deck resistance. The resistance of each coil will be twice that of the deck resistance. i.e. 2 x 3ohm coils will be 1.5ohm deck resistance.

AWG stands for American Wire Gauge. It is the standard measurement for the thickness of the wire. SWG is the UK equivalent but is not used. AWG is printed on all spools of wire.

Hopefully by now you’ve built yourself an awesome coil or two! If you’ve had any problems with the Coil Wrap Calculator, please see the user guide here.

If you’ve got any questions or feedback then please feel free to drop us a comment at the bottom of the page. We’re really grateful for all the positive feedback we’ve had so far, thank you!

If you’d like to share this calculator then please hit one of the share buttons below.

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Comments 92

  1. Do you have any information on rebuilding an Aspire Cleito Coil?
    The coil is a .4 ohm, (40-60w)….

    I am using 22 gauge Kanthal A-1 wire, by using your calculator I have tried 4, 5, and 6 wraps….with inside diameter of 4 mm…. I am unable to get to .4 ohms.

    Is your site calculator meant for Horizontal coils v.s. Vertical coil like the Aspire Cleito.

    1. Post

      Hi Peter, thanks for your question.
      Firstly, we’ve not re-built an Aspire Cleito coil before so can’t give any advice but do know its possible to do.
      A single wire 22 gauge, 4mm inner diameter at 5 wraps should give you around a 0.4 ohms coil. What resistance is yours coming out at?
      Horizontal and Vertical only relates to the orientation of the coil, the physical properties between the two are the same. The lead length will be slightly different but this will only alter the overall resistance by about 0.2 ohms.

      1. The resistance 4 wraps .55, 5 wraps .68, 6 wraps .87………
        Hello Richard,

        I have tried to copy the exact length and diameter of the
        Aspire Cleito coil wicked portion and the length of the leads to the end……..

        I have tried to half the size in length of the wicked portion and tried 3 mm inside diameter as well….and the same with 4 mm inside diameter….

        No joy as of yet, are you able to find an Aspire Clieto .4 ohm
        (40-60w) to figure out what I am not understanding to the rebuild, or I could send you a couple to work on?

        1. Post

          Hi Peter, the coils you’re build are following the pattern I’d expect even though they are slightly higher in resistance. I am at a loss why they are higher though. Have you tried using the coils to see how they perform? Replicating the exact Cleito coil resistance may be a tall order. It is possible that the tail leads aren’t making a good enough contact on the coil casing. Even though your coil resistance is a bit higher than expected, a regulated mod wont worry about that, you can adjust the wattage to achieve your perfect draw.

          1. Hello Richard,
            I just make a similar Aspire Cleito coil I believe inside diameter is 5 mm with similar coil spacing with the wraps and leads length with the Kanthal 22 gauge wire. Tested and the output was .52 ohms. I up the voltage to 55-60w and seems to work….but slow
            When I look inside the Aspire Cleito coil the wraps are not tight but spaced out….
            Any information you can figure out on how to get .4 ohms much appreciated.

          2. Post

            Hi Peter, a coil with 5mm inner diameter using 22 gauge will cause a slower ramp up speed. 5mm is pretty big. Try building a 22 gauge, 3mm diameter with 5 wraps and see what the resistance comes out at. Try it around 50W first and increase the wattage a bit if it’s still a slow ramp up speed. Hope this helps.

  2. hi what wire could I use for 24ga ni80 coil 0.4ohm I can’t work it out above any help I would gladly appreciate it its for Vandy Vape Pulse Vessel Kit. kind regards Billy.

    1. Post

      Hi Billy, thanks for your question but I’m unclear what it is your asking? You ask what wire you can use but you’ve said 24awg ni80 at 0.4ohms. This wire spec comes out at 6 wraps which is good. You can use a different wire type and gauge but you ultimately need to aim for around the 6 wraps.
      You can input any wire type, gauge and resistance into our calculator and it will specify the number of wraps needed to make that coil but i would aim for around 6ish wraps. Hope this helps.

    1. Post

      Hi Oscar,
      The number of wraps is always per coil. If you select a dual build deck, meaning you intend to make two coils and fit them both as a parallel build, then the resultant number of wraps shown is for each individual coil. Hope this helps?

  3. Can anyone help me I have a TESLA COUPLES KIT RDTA was given to me , it says use Clapton Coils (0.3Ω) I check out YouTube videos about the tesla, their builds comes out as 0.16/0.15 my one comes as 0.24 put am using Clapton Coils (0.3Ω) am I doing anything wrong. Many thanks for any advise .

    1. Post

      Hi Billy, thanks for your question.
      We have not tried the Tesla Couples RDTA kit but from your message it sounds like the dual coils you’re using aren’t securely screwed into the posts. One of the coils if not secured correctly will give a higher resistance reading which in turn will increase the overall deck resistance.
      Using dual coils of 0.3ohms each should give you an overall deck resistance of 0.15 ohms. Try re-securing the coil leads into the posts to see if it reads the right resistance. Also are you getting the same or the correct resistance from the second RDTA with the two coils fitted.
      Can you check the deck resistance on an ohms reader or another mod to see it it’s the Tesla mod giving you a false reading. I hope these pointers help and you can resolve your problem.

  4. Thank you so much for this calculator (and all the other resources on this site)! I’m new to DIY coils and RTAs, having started my vaping journey with factory verticals and pod systems. But I found a Vertex Plus RTA for a ridiculously low price and thought I’d try my hand. My first “seat-of-the-pants” attempt was a couple of 6 turn 26 ga. horizontals in 316SS, 2mm I.D. They came in at 0.18Ω on my Argus GT (just based on guess work). I pre-fired them, tweaked them with ceramic tweezers to eliminate hot-spots, wicked them with Cotton Bacon Prime and pre-soaked both wicks with juice. They were awful! No matter what I tried, smart mode, power mode, TC, it resulted in dry hits. So I tore it all apart, washed the tank and started over.

    One of the first things that came up in my search was your site. I plugged in the numbers aiming for a 0.3Ω dual coil build. I used the same 26 ga. 316SS wire, went to 9 turns and 3mm I.D. Boom! First try 0.28Ω on the Argus GT. I did all the prep / wicking meticulously. Pre-soaked the wicks, assembled the tank and had similar results, albeit better than before. After trying just about every combination of wattage, TC and air flow, the best I could get was maybe 3 puffs before I had that lovely burnt cotton taste. I knew it was me, despite the low cost of the tank, because the Vertex Plus has good reviews. So, back to the Internet for more information.

    It turns out that his tank allows you to shut off juice flow. I had no idea…and…essentially no juice! Duh! With a little tweak to the ports the wicks were wide open and the clouds are in the air! At 36W on the Argus GT with the tank set up correctly I can practically blank out the screen on my laptop with one 2.0 second puff. The flavor’s good now and so is life. As an avionics / electronics / instrument tech with 44 years in the field, I really appreciate good technical writing. You’ve nailed it. Thanks again for all the time and effort you’ve put into this site. I’ll be back here for sure.

    1. Post

      Hi Boothe,

      We really appreciate your nice comments regarding our calculator and website content, thank you.

      It was nice to read that you had done everything right in your diy building and didn’t give up when it wasn’t working right. Glad to hear that you found the issue was the juice control on the Vertex.

      We’ve found many many times that building and wicking on each RTA is slightly different and requires tweaking to achieve that ideal vape, what works for one doesn’t for another. All part of the fun and sense of satisfaction when it does work right, not to mention the greatly reduced cost when diy building.

      Happy vaping Boothe and thank you again for your comments.

  5. hi, I have seen a speaker magnet about size of a hand produce enough voltage to light up a light bulb on UTube, about 50 coil turns or so. I assume it is dc output, my bulb is 230v LED a.c. lets say 5watts power i would need a coil round a magnet of approx 9 ohms, How do I know coil size/winding to make 9 ohms

    1. Post

      Hi Hans,
      You might be wise to google the authenticity of this project. Generating any sort of power from a coil winding around a magnet requires that magnet to be continuously moving in a out of the coil windings to produce a small amount of power.
      Generating 230v ac from a static magnet with coil windings around it is NOT possible.
      To answer your specific question, any type of coil wire will have a resistance per meter value. The number of turns is determined by the size of the diameter your winding your coil around and the gauge and wire you’re using. The resulting length of wire will give you the resistance you’re after.

      1. hi, I believe I didn’t say what I wanted properly, but if you UTube

        “Free energy generator magnets very easy – Simple DIY experiments at home 2018”

        you will see lots of ideas being shown making a light bulb illuminate with a speaker magnet, coil and lamp, just concerned of high 230V DC, I just want to make 12v light up 12v 4w led lamp,

        1. Post

          Hi again Hans,
          If this is what you want to achieve, I suggest you google your specific requirement to see the feasibility of doing this. As per my previous comment, a static magnet with a coil around it wont produce any power. This calculator has been designed specifically for vaping applications.
          Good luck.

  6. I’ve been running a .10 build on a single vtc5a mech forever now. I know this isn’t safe and I was hoping anyone knew a coil build that hits similar to mine at a slightly safer resistance. My daily build is a dual parallel NI80 24 awg 3mm diameter 5-6 wraps.
    Open to any builds thanks!

    1. Post

      Hi Luke,

      Thanks for the comment. Unfortunately, like you said your build setup definitely isn’t safe. Your Sony VTC5A has a CDR value of 25A and your 0.1ohm build is drawing 42 Amps from the battery at full voltage (4.2v). You’re also vaping at around 175W with that setup. As your battery voltage reduces the current drain and wattage will go down too, but it’s still pretty high.

      My best advice would be to start by increasing your coil resistance to try and bring the current drain nearer the CDR value of your battery. Then you can start to play around with different build types to try and achieve your desired vape. Or you’ve got the option of going for a higher CDR rated battery like a Samsung 20S, which is rated at 30A. While the hit you get may reduce at least you’ll be safer.

      Hope this helps Luke. Happy vaping!

    2. Dude I pretty much always vape .04 ohms. some guys say that their sweet spot is at .08. I’ve never had a problem, but I only have a year and a half serious building under my belt. I mean, always be ready to chuck it!
      Kennedy 21700 Vindicator Kennedy 28mm RDA

      1. Post

        Hi Nick,
        I’m wondering if the coil resistance you’ve mentioned of 0.04 ohms is incorrect? Vaping on a mech mod this low will seriously stress your battery. This equates to vaping at a wattage of over 400W, drawing over 100 Amps from a single 21700 battery. Do you mean 0.4 Ohms?
        Check out our This will give you an indication of safe current drain using a mech mod on whatever battery you’re using.

    3. I use a three parallel 28 ni80 and I build chain coils my target resistance is .24 which for dual coil is 9 full wraps but for a single coil would fit the bill and it hits like a freight train and only has a 17 amp draw at 75 w o hope this helps Luke

  7. Hi, very grateful with your calculator here.
    I use your calculator result to fit my Aegis Boost RBA, aiming for 1.2-1.3 ohms for my 50 mg SaltNic.
    Using a Kanthal A1 at 28 awg, and the rest is from your calculator. It’s on the spot!
    Can you suggest the best wattage range for that setting? It can’t be included in your calculator right 🙂

    I’m a newbie in vaping, just stopped a 20 years smoking span. One day a friend gave me an MTL device and the smoking just stopped. I felt all the burnt stuff and yeah, just realized that smoking is a horrible mistake.

    Well because I’m already addicted to the nicotine, so I’m looking for a decent and proper replacement that as close to a cigarette as I can get. Because I don’t wanna go that road again.


    1. Post

      Hi Muy,

      Thanks for the comment and really glad you like the calculator! We also love the Aegis Boost and actually featured it on our Best Pods of 2020 list. We’re also going to be posting a review of the Aegis Boost and RBA soon.

      For the coil setup you’re using I’d suggest starting off at 10W, especially as you’re vaping with 50mg nicotine salts. You can see how that vapes and increase your wattage slowly up to around 15W to find your ideal sweet spot. I wouldn’t think you’d need to go much higher than that. Please let us know what you find the best wattage to be though. It’s great to hear that you’ve had such success with vaping.

  8. Hello
    I am looking for a replacement for my current coil app because it’s no longer on iOS I make coils such as staggered fused Clapton, alien & Clapton out of more than one type of wire how long before we’ll see them added to the list thanks

    1. Post

      Hi Wolf,

      I’m currently designing a separate calculator specifically for clapton, fused clapton and alien coils. I’m hoping to have it finished and available in the near future but it’s certainly no easy task!

      When we do upload a new calculator for more advanced coil builds we’ll separate it from this one. A lot of the positive feedback we get for our coil wrap calculator points to it being user friendly while covering the majority of options most users need.

        1. Post

          Hi Apathy Miller, not sure if you mean the App or the Clapton calculator? We’ve decided not to convert our calculators to app based because of the time and cost involved.
          Regarding the Clapton calculator, unfortunately this has been put on the back burner as existing work on the guides and reviews has taken precedence at the moment.
          I have been working on it on and off and am making progress but to ensure its accurate is taking a long time.

  9. Hi, I just bought an Aspire Triton RTA kit and the supplier recommended and supplied a spool of Vandy Vape- Superfine MTL Fused Clapton SS316L wire. – 3.88ohms/ft. I am struggling to use this and it is so difficult to coil. I managed to make one of about 6 wraps and got 1.6ohms on my ohms reader. When I put it in my mod it will not vape at any wattage. Tried fro 5 w to 30 w. Nothing much, just a fine mist of vapour as good as breathing fresh air.
    I don’t know what I am doing wrong here. Ideally, I want to get 0.5 ohms like my ECL coils.

    1. Post

      Hi Sakthy,

      Thanks for your comment. Stainless steel is certainly not the easiest to coil. Is the wire you’re using 32gx2 + 38g wrap? If so six wraps of this should give you approx 0.7ohms. If you’re heating the coil at 5W then you probably won’t produce much vapor. If your coil is 1.6ohms though I’d expect a fair amount of vapor anywhere above 15W.

      Did you dry burn your coil to make sure there were no hotspots? Are the individual wraps on the coil touching each other (compressed) or spaced? We’ve got a section in our coil building guide that covers potential problems with a coil. It could also be worth experimenting with your wicking method as well. This can really affect the vapor produced.

      Also are your 0.5ohm ECL coils direct-to-lung (DTL) or mouth-to-lung (MTL)? A MTL coil is typically around 1ohm. Keep trying though as you will get there. Please get back in touch and let us know how you get on.

  10. Have a question hoping you can answer. Is there anyway to use your calculator with coils like a tiger coil. Using kenthal ribbon wire with ni80 core.

    1. Post

      Hi Daryle,

      I’m sorry but that’s not an option on our calculator at the moment. We are looking to add this in the future however. The tiger coil is a twisted ribbon wire with a single round wire and to make it more complicated there are two different types of wire being used.

      A workaround you can use on our calculator would be to select either Kanthal or N80 wire in the wire type and parallel 2 strand in the wire profile. This will give you an approx result but won’t be 100% exact. Hope this helps Daryle.

  11. Hi, I’m using an aegis x zues x rta dual coil at 0.12 resistance while using a molicel p26a (25A) per battery test review.

    is it safe to chain vape between 60-80W?
    thank you.

    1. Post

      Hi there and thanks for your comment!

      Is the Aegis device you have a single or dual battery mod? It’s important to note that the resistance of the coil has no relevance when using a regulated mod (like the Aegis you’re using). Instead it’s the wattage you vape at that determines the current drain of the battery.

      A single 25A battery is safe up to approx 70 watts. A dual battery mod using the same 25A batteries is good up to 140 watts. If you want some more information you can use our Battery Amp Draw Calculator that works out what you can safely vape at with any battery type. Hope this helps! Happy Vaping!

  12. Hi! I’m new on diy coils and a really dumb one. I just discovered this twisted kanthal wires. I used a 24AWG kanthal wire and hand-made it (watched a video on youtube on how to do it). I used a 7/6 wraps (per coil, btw it’s a dual coil deck). The resistance, 0.21, showed too low for my battery with 20A maximum current with my variable Smok T-Priv and an atomizer of Geekvape Avocado 24mm.

    My question is, how can i make my coil become at least 0.4-0.5 in resistance? How many wraps? I used your calculator (btw, it’s soo cool!) and it showed that i should make a 19/18 rounded half wrap? What does this mean? Does this mean that I should wrap my coils 19/18 on both or it’s the total for both coils? Any suggestions? Sorry for too many questions. lol. Thank you very much!

    1. Post

      Hi Mica,

      Thanks for the comment and really happy to hear you like the calculator! Hopefully the info below answers all your questions…

      1) Using twisted kanthal on a dual build deck to achieve an overall deck resistance of 0.4 or 0.5ohm will mean too many wraps for your build deck. Ideally you want around 6 wraps per coil to be able to fit in between the deck posts. The 19/18 rounded half wraps that shows on our calculator means you’d need to wrap both your coils this amount of times.
      2) Rounded half wraps means the coil legs point in the same direction. Full wraps means the coil legs are pointing in the opposite direction. This depends on the layout of your build deck and how the coils fit in to the posts.
      3) When you select ‘Build Deck Configuration’ to ‘Dual’ the results will show you need to build 2 coils, each at twice the resistance of the overall deck resistance. The resistance of each individual coil is shown in brackets to the right of the number of wraps.
      4) Your Smok T Priv is a regulated dual battery mod so the coil resistance is not important, it’s the wattage you vape at that determines the current being drawn from your batteries. If your using 20A batteries, you cannot vape any higher than 110W before you’re in danger of overloading your batteries (see our Battery Amp Drain Calculator). The Smok T-Priv will work with any coil setup above 0.06ohms.
      5) If you’re referring to the ‘Current Drain from Battery’ in our results section being higher than your 20A max current batteries, that only refers to the current being drawn if you’re using an unregulated mod. Your twisted kanthal of 24AWG at 6/7 wraps on a dual build deck gives you an overall resistance of 0.21ohm, meaning each coil is around 0.42ohms. This will be fine as long as you don’t vape higher than 110W using your 20A batteries.

  13. Hi there, thank you so much for a great calculator. I am completely new to coil building and was able to build my first dual coils and I think they turned out alright. I am using the Dovpo-Blotto RTA on my Vaporesso Gen and have a few questions. I recently purchased Geekvape Twisted 26AWGx2 Kanthal A1 wire to experiment my builds with. I usually aim for anywhere between 0.19-0.25 ohms on my vape, however, I am not sure exactly what the tail lead length (total) will be. I use a coil cutting tool and cut each leg to +/- 4.5-5mm. Another question is regarding the wraps. I usually use 3mm diameter coils and it works out to “Rounded to Half Wraps = 6/5”. What exactly does this mean? Would I need 6 wraps or 5 in total?

    I usually use pre-built coils and use Nano-Aliens +/-0.19 Ohms dual. But am experimenting on my own builds.

    1. Post

      Hi Richard,

      Thank you for the great feedback, really glad you like the calculator. It’s a nice setup you’re using too, both the mod and tank are great choices! The total tail lead length will be the sum of the two legs, so if you’re cutting each leg using a coil tool to 4.5-5mm, the total lead length will be 9-10mm.

      The difference between full and half wraps depends on the way the coil(s) are fitted into the build deck. A half wrap refers to the coil legs pointing in the same direction whereas a full wrap means the coil legs point in opposite directions. In your case, the ‘6/5’ relates to 5 wraps counted on one side and 6 on the other.

      Hope that helps Richard. Good luck with coil building. We alternate between pre-built coils and wrapping our own. If we’re feeling in the mood, we usually wrap a few coils in one sitting so we’ve got a couple to hand. Anymore questions feel free to give us a shout!

  14. I’m a bit dumb, when I look at the results after calculating its specifies 158.30 wraps, I know they don’t mean 158 times to wrap. Does that mean mm of length…lmk please

    1. Post

      Hi Frankie,

      Thanks for the comment. After you hit the result button on our coil wrap calculator the first line of the results will tell you the number of times you need to wrap your coil to achieve your desired build. If your result showed 158.30 wraps then unfortunately you’re trying to build a coil that’s impossible to fit in a vape tank.

      The average number of wraps on a vape coil is anywhere from 6-10 wraps for a good result. If you can get back in touch with us and tell us what wire type you’re using and the desired resistance of the coil you wish to build then we can give you a little more guidance. Hope to hear from you soon 🙂

  15. Hi, the calculator is great, thanks. I’ve just built my first coil using 28awg and 2.5mm diameter with A1 Kanthal , I was aiming for about 1.2 ohm and got 1.15 so I was happy enough with that for a first go. My question…. is there any advantage / disadvantage (Flavour etc) building a coil with 3mm diameter and 1 less wrap again aiming for about 1.2 ohm ? I’m using the single coil rba on the Aegis Boost at 13 watts. Thanks

    1. Post

      Hi Russell,

      Thanks for the comment and we’re really glad you like the calculator. Your question is a good one and the answer is a little open-ended. It really is down to individual preference, how you vape and what size coil will fit into your RBA deck.

      The smaller diameter will obviously result in a thinner wick meaning less absorption of e-juice. The surface area of both coils will be approx. the same and so will the ramp up speed (time it takes your coil to fully heat). Different wicking techniques also play a part in flavor production. My best advice would be to try it and see if you find any noticeable difference. Hope this helps and please let us know what you find.

      1. Thanks Richard, well as you say the only obvious thing is more wick, other than that I can’t say I noticed any other difference. However I shall continue to build 3mm coils as the extra wick holding more juice seems to last longer. Many thanks again. Russell.

  16. What’s the current battery drain? I’m using Samsung 18650 green battery on a mech mod and have a .11ohm dual parallel build just wanna make sure I’m not drawing too much power. It says on your website My current battery drain is 38a. What’s my battery ratted for? Am I safe?

    1. Post

      Hi Pierce, DO NOT fire the mod. Your set-up is NOT SAFE. Your coil build (deck resistance) at 0.11ohms is too low. You’re drawing 38Amps from a Samsung 25R 18650 battery which is rated at 25Amps. Your vaping power at this build will be approx. 160Watts.
      That battery is not designed to draw that much current. There isn’t a battery on the market capable of supplying that amount of current at present. You need to increase the coil resistance to 0.18ohms or higher so not to draw above 25Amps from the battery. Use our power, resistance and current calculator to check what build is safe for the CDR rating of any battery. Hope that helps

    1. Post

      Hi Tony, this is usually caused by one of three problems… Either your coils are slightly different resistance, you’ve got heat spots or your coil leads aren’t fixed into your deck posts properly. Heat spots are a simple fix. Just dry burn the coil and gently ‘rake’ a mini screwdriver or coil jig over the coil while it’s glowing. If you’re sure both coils are of equal resistance, make sure your coil leads are of equal length and attached securely. Hope this helps

  17. Hi. Thanks for the calc, it’s incredibly helpful.
    Is there a limit to the number of wraps we should use?
    E.g. I’m vaping with 14 wraps on 30gauge ni80, single coil. I want one battery to run all day, so the power required is low, resistance is 2.23.
    However, I saw on a YouTube video about building, that we should aim for 8-10wraps, no more. Why?
    The more wraps I have, greater surface area burning, greater Flavour.
    Basically, is there a limit on wraps?

    1. Post

      Hi Tony, glad you found the calculator helpful! In terms of the number of coil wraps, we usually recommend somewhere in the ball park of 6-8. This is also ideal for most build deck sizes! There’s no reason you can’t build with more coil wraps than this, however more wraps doesn’t necessarily guarantee better flavour. Above all, it’s best to just use whatever you find works best for you. Just keep in mind, above 10 wraps you start to experience potential slower ramp up speed (longer time to heat your coil) which obviously will drain your battery faster. Hope this helps

      1. not trying to hijack this so first off thanks. .This was my exact question because I started with Clapton nichrome and found for me 4 wraps single build with that taste best.. However they didnt have any more fused clapton wire so I got the 22G Ka A-1 and tried dual and found this calculator to be very accurate. I am still learning what I like with the Kanthal wire but if my build is 0.23 on the dual and the single was 0.34 which would technically use less power on the battery? I wanna use abit less juice as I am averaging 100ML in 2 days ooF

        1. Post

          Thanks Simba, really glad you like the calculator! In reply to your question there are two possible scenarios:

          1) If you’re using an unregulated mod (mechanical mod) a 0.23ohm coil will draw 18.26A and a 0.34ohm coil will draw 12.35A. The 0.34ohm coil will therefore draw less power from your battery. Our ‘Power, Resistance and Current Calculator‘ lets you quickly work out the drain on your battery when using a mechanical mod.

          2) Alternatively, if you’re using a regulated mod the resistance of your coil doesn’t affect the drain on your battery. Instead, the wattage you choose to vape affects how much power you draw from your battery. Obviously the higher the wattage you vape at, the higher the draw on your battery will be. In this case you can use our ‘Battery Amp Draw Calculator‘ to check the current drain on your battery when using a regulated mod.

          Hope this information helps Simba and any more questions feel free to get in touch! 100ml is a LOT of juice!! Maybe you could try reducing the wattage you vape at or increasing your coil resistance….vape juice isn’t too cheap these days, especially if you don’t mix your own e-juice. Happy vaping Simba 🙂

  18. hi richard ,
    thanks for providing the calculator , they work fine.
    i am completely new to building coil.
    could you shed the light on how to count wraps?
    sometimes i got the same resistance with bit different wraps
    i’m using ni80 24 awg

    1. Post

      Hi Ronald,

      Thanks for your comment and glad you found the calculator useful! If you’ve not already done so then take a look at our calculator guide and coil building guide. These will really help you understand the process of building a coil and using our calculator.

      Once you calculate how many wraps you need, it’s a simple process of tightly wrapping the wire around your drill bit or coil jig. One complete turn is one wrap. Also make sure your wire is not overlapping when you wrap your coil. The resistance is determined by the number of wraps, the diameter of the wire and circumference of the wrap. The resistance will only change if any of these parameters change. Hope this helps Ronald, any problems feel free to let us know.

    1. Post

      Hi Ken, thanks for the comments. If you’re building with Kanthal A1 32AWG and you want a target resistance of 1.4ohms, you’ll want a 2mm inner coil diameter and a total of 3 full wraps. This obviously won’t give you a coil with much surface area, which will impact flavor and vapor production… Our advice would be to perhaps switch to 30AWG in which case you’d need 6 full wraps to hit 1.4ohms. Hope this helps! Any problems, give us a shout!

  19. Hi Richard, great calculator and posts! I am completely new to building having just moved up from a Smok RPM40. I purchased a Cube w/ Engine MTL tank. I understand that Kanthal A1 with 4 coils would produce around 1.2ohms? as the cube is variable wattage can I safely use on the 1-80w range?
    thanks bud

    1. Post

      Hi Ben,

      Thanks for great feedback and glad you like the calculator. Congrats on getting the OBS Cube with the MTL Engine Tank, that’s a great little set-up! As for whether you can use the Mod safely, the internal battery will work on the max wattage it’s been designed for so you’re good to go.

      Four turns of Kanthal A1 will produce a 1.2 ohm coil using 30AWG wire. As we always suggest, start off on a low wattage (15W) and adjust upwards until you find your sweet spot! With a 1.2 ohm coil you’ll probably be looking at around 15W – 25W for a satisfying vape but it really depends on personal preference. If you’d like any tips on building your coils then check out our guide on coil building. The way you wick your coil can also have a massive effect on the end result. Be sure to have a read through our wicking guide too.

      Hope this helps Ben, happy building and vaping!

      1. hi Richard, thanks for the reply! I get bored rather quickly and have just ordered a Zeus and OFRF Gear (after watching loads of reviews!!) could you tell me if the cube will take 7a drain safely (2 x 1.2ohm coils)?? just checking before I blow my face off!!!!!!
        cheers bud

        1. Post

          Hi Ben,

          No worries. The cube is designed to work with a minimum 0.1ohm resistance. Your combined resistance is 0.6ohms so no problem there. The internal battery will easily cope with 7A drain. I’m guessing from the spec of the mod it’ll take in the region of 25A safely. Vaping in the region of 15W – 50W shouldn’t be an issue…your face should be fine 🙂

          Also on a regulated mod remember the coil resistance doesn’t determine the current drain, it’s the wattage and voltage. Hope this helps Ben! Happy vaping!

    1. Post

      Hi Imran,

      Thanks for the question. Unfortunately our calculator doesn’t currently allow for exact calculations on a Clapton wire type, but we will be adding this in the very near future. To give you a very close result you can just select ‘dual strand’ and input the 28 AWG inner core wires. The thinner wire wrapping around the core wires only changes the number of wraps needed by a fractional amount. Hope this helps Imran.

  20. This is by far the best, most simple and accurate coil calc I’ve had the pleasure using! Spot on calculations! I can now trust this wholeheartedly and stop doing long hand calc. A huuuge thumbs up and I hope to see an app in the apple app store soon! Thanks again and great work!

    1. Post
  21. Thanks for the calculators, they work fine. How come with Steam Engine the outcome for a 26 AWG Kanthal, dual coil aiming for 0,5 Ohm, 3 mm diameter I get 45 Watts for mod-settings and with Coil Wrap Calculator the same build gives 35.28 Watts?

    Excuse me foor my poor English.

    1. Post

      Hi Jan,

      Thanks for the comment and glad you like the calculator. My understanding of Steam Engine’s recommended wattage of 45 is a suggested wattage to set your regulated mod to with the coil build you’ve input.

      On the other hand our 35.28 Watts figure refers to the wattage you would be vaping at, using a fully charged battery at 4.2V, on an unregulated mod (mechanical mod). This figured is derived from Ohms Law. Ultimately though you can experiment with the wattage you’re using on a regulated mod and see what works best for you. Just be careful not to go too high! Hope this helps Jan.

    1. Post

      Hi Mike,

      Thanks for the message. Currently our calculator doesn’t include a Clapton option but I am in the process of developing the calculator to include Flat, Ribbon and Clapton coil builds and we’ll be updating this soon.

  22. Hello Richard, thanks a lot for providing the calculator. What I am trying to figure out – same on/with Steam Engine’s calculator – is how to deal with Clapton Wire in these calculators?
    For example: N80, 24ga + 36ga. Am I supposed to use “2 strands” then and what’s about ga?
    I am usually getting 0,22 to 0,25 Ohm with 6 to 7 wraps in a dual build deck, 3 mm inner coil and with legs cut off between 4,5 and 5 using Geek Vape’s N80, 24ga + 36ga.

    Thank you in in advance,

    1. Post

      Hi Max,

      At the moment our calculator doesn’t include Clapton calculations but we will be adding this in the near future.

      To give you an approximate answer of wraps needed when using Clapton wire, input the gauge of the inner or core wire and ignore the gauge of the thinner wire wrapping around the core. The wrap gauge is pretty insignificant compared to the core gauge and only changes the number of wraps required by a very fractional amount. This method will give you a very fairly close result. And for this you’ll just need to select ‘single strand’. Hope this helps Max. Any problems feel free to get in touch.

  23. the best coil calculator so far, do u have any android or ios based app for this? I’ll definitely install it.
    big thanks

    1. Post

      Hi Darwin, thanks for the feedback, we really appreciate it 🙂 We’re actually hoping to have a coil wrap calculator app ready for release in the near future!

  24. Hi sir, im using minifit.
    I tried to recoil using kanthal A1 32 awg. When vaping it was very thight seems like blocked airflow. What is the problem? They suggested 32 nichrome80. If i used 30 awg instead, is it gonna give more flavor and vapor؟

    1. Post

      Hi Abdul,

      Thanks for the comment 🙂 I haven’t personally built on a minifit device before but the problem you’re describing sounds like a wicking issue. The airflow can sometimes be restricted by wick sitting over the air holes. Perhaps try readjusting the wick in your coil, making sure the air holes aren’t being blocked.

      If you choose to use 30 awg wire with the same number of wraps, the surface area of your coil will increase and provide slightly more vapor. However, this won’t necessarily fix the problem you’ve described. Hope this helps, please let us know how you get on!

  25. When I’m making a parallel coil, is the number of wraps the number of times I wrap the coil jig? Or do I half it because of the two wires?

    1. Post

      Hi Nichole, thanks for the comment 🙂 You don’t need to half the number of wraps. As long as you’ve selected ‘Round (Parallel 2 Strand)’ our Coil Wrap Calculator will automatically calculate how many times you need to wrap your wire around the coil jig. Great choice of coil build, I love the parallel coil build myself! If you’re interested in advanced coil builds, please take a look at our post; Coil Building Tips & Tricks – How to Build a Vape Coil in 6 Easy Steps!

      Hope this helps! Any problems, feel free to drop me a reply!

  26. Please help me If i am using a regular ni80 32 ga wire, how many wraps over which diameter to give me same hit like mini fit ready made one??

    1. Post

      Hi Ahmed, thanks for your comment 🙂 I’ve not tried the Mini Fit personally but I’ve tried a few other Vape Pod devices and I find they all differ slightly in performance. If you’ve now moved on to building your own vape coils on an RDA or RBA, the best advice I can give is to experiment with a few different coil builds to find out what works best for you.

      Perhaps a good starting point would be 5 wraps of Ni80 32g with an inner coil diameter of 2mm. This will give you a 1.4ohm vape coil which I think should roughly mimic the vape experience on a Vape Pod device. Again, have a play around with your coil diameter, target resistance and vape wire gauge to see what suits you best!

      Hope that helps, please let us know how you get on!

  27. I’m going for a 0.3 ohm coil using 28G Kanthal A1. It’s telling me I need 1 and a bit wraps, surely that can’t be right. Any advice.

    1. Post

      Hi Kyle, if you’re building a 0.3 ohm single coil you’re going to struggle using Kanthal 28G for the very reason you’ve mentioned (too few wraps). My advice would be to either increase the wire gauge or use a different wire type (Titanium, Stainless Steel etc), thereby increasing the number of wraps required to reach your target resistance. I would also suggest playing around with different deck configurations, perhaps a dual coil setup… Good luck and happy building! 🙂

    1. Post

      Hi Alan, thanks for the feedback! You’ll be pleased to hear we’ll be including flat ribbon wire in a future update to the coil wrap calculator 🙂

    1. Post
  28. This is the first time that I’ve used your site for building and find it much easier to use than most that I’ve tried. Great job.

    1. Post

      Hi Thomas,

      Thanks for the great feedback!! We’re really happy you like the calculator and it’s always nice to hear it’s easy to use. We’d really appreciate it if you share the page with friends and family too! Have a great day!

    1. Post

      Hi there,

      Thanks for your comment and I hope the following helps. I think you’re getting slightly confused here between voltage and wattage. The ‘4.2v’ refers to the voltage of a fully charged 18650 vape battery; as you use the battery the voltage (capacity) drops until you need to charge it again. On the other hand, wattage refers to the power that you want to vape at. In a regulated mod you can adjust the wattage to your particular needs and vape away.

      On an unregulated mod (mechanical mod) you can work out the wattage you’ll be vaping at with our ‘Ohm’s Law Calculator’. Simply put in the 4.2v figure to represent your fully charged battery and then put in the resistance of your coil(s). Hit the calculate button and the calculator will show you what power (wattage) you’ll be vaping at with a fully charged battery.

      Hope this helps 🙂 Let us know if you have any problems.

  29. i do not understand what the tail lead length is. Im going for a 0.18-0.2 ohm dual parallel build. Kanthal A1 wire, but the tail lead length is always put on 5 in your website, is it the normal?

    1. Post

      Hi Kal,

      Thanks for the comment! The tail lead length simply refers to the ‘legs’ of the coil I.e the wire showing either side of your wrapped coil that connects the coil to your build deck. The default is set to 5mm total (2.5mm per leg). We usually find this number leaves you with enough of a leg to easily fit the coil into the deck post, however you can alter this number to suit your needs.

      Hope this helps Kal! Any further questions please feel free to get in touch!

    1. Post

      Hi Jimmy, not sure exactly what you’re asking. The vaping power is derived from the coil build resistance and assumed full battery charge of 4.2V (as per ohm’s law) Hope this helps!

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