Amps to Watts to Volts Calculator

Amps, watts, and volts are tied together by the power law. In a direct-current or single-phase resistive circuit, power equals voltage times current: `W = V × A`. Rearrange it and you can solve for whichever value you are missing — `A = W ÷ V` or `V = W ÷ A`. This calculator lets you pick what to solve for, enter the two values you know, and reads out the third. It is a quick planning and learning tool; a licensed electrician should confirm any figures used for real wiring.

Alternating-current circuits add power factor. Real power in watts equals volts times amps times the power factor, a number between `0` and `1` that reflects how well voltage and current stay in step. For purely resistive loads like heaters and incandescent lamps the power factor is `1`, so `W = V × A` holds exactly. Motors and electronics run lower, often `0.8` to `0.95`, which means they draw more current than their wattage alone suggests.

Three-phase power brings in a `√3` factor. For a balanced three-phase load, real power equals `√3 × V × A × power factor`, using the line-to-line voltage. That is why the same current at `480 V` three-phase moves far more power than at `120 V` single-phase. Toggle the phase and enter a power factor, and the calculator applies the right formula automatically.