Welcome to Vaping Hardware’s Ohms Law Calculator!

For those of you unfamiliar with Ohms Law, this calculator allows you to determine whether the coil, tank and mod you’re using will work safely together. This is especially important when using a mechanical mod or unregulated device.

Just fill in two of the below fields and the calculator will work out the rest for you!

If you’re unfamiliar with Ohms Law and how it relates to battery safety, please take a look at our** guide to Ohms Law!**

**Please note, you only need to enter two of the below values. If you enter three the calculator won’t correctly work out the remaining value.**

We’ve included a handy FAQ at the bottom of this page!

#### Enter two values into the form below:

#### FAQs

It’s always useful to at least have a basic **understanding of Ohms Law** as it relates to vaping. Especially when you’re using a mechanical/unregulated vaping device or building sub-ohm coils with a resistance of less than 1ohm. Ideally, you should be aware of the correlation between resistance, current, voltage and power to prevent drawing excessive current from your battery.

For obvious reasons, putting too much strain on the battery you’re using is **not **a good idea!

Using Ohms Law, Voltage (V) = Current (I) X Resistance (Ohms). Alternatively, Voltage can also be derived from Power (W) / Current (I) or the Square Root of Power (W) X Resistance (ohms)

Using Ohms Law, Current (I) = Voltage (V) / Resistance (Ohms). Alternatively, Current can also be derived from Power (W) / Voltage (V) or the Square Root of Power (W) / Resistance (ohms)

Using Ohms Law, Resistance (Ohms) = Voltage (V) / Current (I). Alternatively, Resistance can also be derived from Voltage (V) Squared / Power (W) or Power (W) / Current (I) Squared

Using Ohms Law, Power (W) = Voltage (V) X Current (I). Alternatively, Power can also be derived from Current (I) Squared X Resistance (Ohms) or Voltage (V) Squared / Resistance (Ohms)

Thanks for using our Ohms Law calculator, we hope you found it useful! If you’ve got any questions, feel free to drop us a comment below!

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Happy vaping!

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## Comments 2

How do I calculate Ohm’s Law when in TC mode? I’m running 0.64 ohms, but the wattage fluctuates: about 25 watts when I first fire up, then drops down to about 15. Input wattage in TC mode is 100, cut-off voltage is 12.

Author

Hi Ross,

Ohm’s Law remains constant regardless of whether you’re using a Mod in TC mode. If you want to know a bit more about Ohm’s Law then have a look at our guide to understanding Ohm’s Law. The TC mode means your Mod is controlling the temperature of your coil with pre-determined settings.

We usually talk about Ohm’s Law when it comes to a mechanical unregulated Mod. As your using TC mode you must have a regulated Mod, in which case Ohm’s Law is calculated slightly differently. You might find our Battery Amp Draw / Drain Calculator useful in telling you some more information about the setup you have. You mention though that your cut-off voltage is 12V which suggests you’re using a triple or quad battery Mod? Is this correct?

Unfortunately I’m unsure why your wattage is fluctuating around 20W. Please can you expand on what the problem is or what it is you want to measure?

Thanks for the comment Ross and hope the information above helps.