Coil wrap calculator

Coil Wrap Calculator

Welcome to vaping Hardware’s Coil Wrap Calculator!

We hope you enjoy using our coil wrap calculator and if you have any problems feel free to check out the user guide here.  If you’re completely new to the world of DIY coil building then you might want to take a glance at our complete guide to building your own coils.

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

Hopefully by now you’ve built yourself an awesome coil or two with our custom built calculator. If you’ve got any questions or feedback then please feel free to drop us a comment at the bottom of the page. 

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

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Comments 23

    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!

  1. 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 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.

  2. 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
    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 🙂

  3. 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! 🙂

  4. 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!

  5. 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!

  6. 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!

  7. 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!

  8. 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.

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