How to Use the Volts to Watts Conversion Calculator

Voltage plus current or resistance — pick whichever is known, and the calculator uses the matching version of the power formula.

Using current:    P = V × I
Using resistance: P = V² ÷ R

Straight power formula if you've got current on hand; Ohm's Law substituted in if you've got resistance instead. This Volts to Watts Calculator covers either path depending on what you already know about the circuit.