How to Use the Amps to Watts Calculator

Same pattern as the Amps to Volts calculator — current plus either voltage or resistance, whichever happens to be on hand.

Using voltage:    P = I × V
Using resistance: P = I² × R

Power from current needs a second value to anchor it — voltage gets you there directly through P = IV; resistance works too, via P = I²R, which is really just Ohm's Law substituted into the same formula. This Amps to Watts Calculator covers whichever one you've got on hand.