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Use the calculator below to work out either power (watts), voltage (volts), current (amps) or resistance (ohms).
Simply enter the other two inputs and our calculator will work out the third and show you’re the power (watts) you will be vaping at.
When/if entering the Voltage, it is always best to enter the max voltage of the battery/batteries when fully charged, e.g. 4.2, to be on the safe side.
When entering the Current, please enter the CDR amperage of the battery. A great resource for batteries is Mooch, who does extensive testing on batteries used for vaping. Click here → Battery Mooch for information.