How to Use the Amps to Volts Conversion Calculator

Current is always required; provide whichever second value is actually known, resistance or power, since the calculator uses a different one of Ohm's Law's two rearrangements depending which is given.

Current alone doesn't get you to voltage — you need one more piece, either resistance or power, and the formula changes depending on which you have.

Using resistance: V = I × R
Using power:      V = P ÷ I

The first is Ohm's Law, plain and simple. The second falls out of the power formula (P = V × I) rearranged for voltage instead. This Amps to Volts Calculator handles both, since which one you know first varies depending on what you're working on.