Vapor Authority

Ohms Law Vaping Calculator

Enter any two value and click the calculate button to obtain the values of the remaining options.

Voltage (E):
Current (I):
Resistance (R):
Power (P):
Volts (V)
Watts (W)

About Spinfuel’s Ohms Law Calculator

The official definition of Ohms Law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Say what? Ohm’s law was named after the German physicist George Ohm who published a paper, or treatise, in 1827, in which he described measurements of applied voltage and current through electrical circuits containing various lengths of wire. Again, say what?

Ohm’s Law. Sounds complicated and serious, doesn’t it? If you’re not familiar with it then it most surely can be. Most of us go through life never needing to call up anything close to Ohm’s Law. However, for us vapers it is important to know at least something of Ohm’s Law. Use it wisely because finding that ‘sweet spot’ with your advanced vaporizer, and a good tank, it suddenly becomes very important.

Plain Words – Ohm’s Law and Vaping

Power, when measured in wattage, is the intensity of the vape. That’s why you are seeing the word wattage often replaced with the word ‘power’. Power is easier to understand for us mere mortals, so when we say that the more power going to your tank or clearomizer coils we mean the more “intense” the atomizer coils work. Too much and you’ve burned up your coils, too little and the flavor and vapor production isn’t enough to impress.

In late 2014 and early 2015 mainstream vapers began buying up very powerful tanks in droves. From the Joyetech Delta 2 to the Kanger Subtank, the eLeaf MELO to the Aspire Atlantis, it has become desirable to vape with lo-resistance coils, anywhere from 1.2 ohms to 0.5 ohms. Soon enough 0.2 ohms will be available in prebuilt, organic cotton coil heads. Ohm’s Law gives you the ability to cut through a lot of experimentation and burnt coils. The
Spinfuel Ohm’s Law Calculator, written by Keyur and Dave, is a page you should definitely bookmark if you’re using the new tanks and a variable wattage vaporizer.

Key Issue With The New Tanks

Have you sampled the lo-resistance pleasures of vaping with the new tanks? If you’re continuing to use clearomizers, or other tanks, with resistance of 2.1 ohms and above, you’ll probably be happier adjusting your voltage settings rather than your wattage (power) settings. So we suggest variable voltage devices rather than variable wattage only devices.

For instance, with a 2.1 coil and a cute iStick Mini, capable of 10 watts, the voltage setting for the “sweet spot” is 4.5v if the wattage is set to the max 10w.

Resistance is not futile

Watts (power) and amps are not what make the world go round for clearomizers or batteries. They come from clearomizer and tank coil resistances which are measured in ohms while battery voltage is measured in volts of course. Knowing the resistance of your coils means intimately grabbing ahold of your vape experience – you control the vape… it doesn’t control you!

Resistance and Voltage Values

For most mainstream vapers, those who are not buried in the maths and simply want to get the best vape they can with the littlest amount of effort, the Spinfuel Ohm’s Law Calculator is best used as a way to find the optimum voltage or optimum wattage for our devices. Here’s what we mean:

We just purchased a new Joyetech Delta 2 tank and we have the 0.5 ohm coil inserted into the tank. (0.5 ohm is a sub-ohm coil). Our battery, or vaporizer, is the VaporShark zDNA 40w box mod, a variable wattage device that maxes out at 40 watts. What is the best wattage to set our iStick to if we’re using the Delta 2?

In the calculator we type in the two values we know, in this case the coil resistance in ohms (0.5), and a whole lot of wattage settings (moved up or down in half-watt settings). Not wanting to be too clever we choose to set the wattage at 30w. We decided this because like all smart vapers we read the manual and learned that the Delta 2 can use as little as 20w and as much as 45w. We split it down the middle, kind of, and choose 30w. The Ohm’s Law calculator tells us that the voltage to the coils is going to be 3.8v, which will produce flavor and vapor that is far below what we know the Delta 2 is capable of. So we reset the calculator (by clicking RESET ALL), type in 40w this time and the same coil resistance and now we’re beginning to get that flavor and vapor we expect from this terrific tank because we’re vaping at 4.4v.

We invite you to take advantage of the Spinfuel Ohm’s Law Calculator as much as you want. Remember, the more you know the more you can control the vape.