Amps To Watts Calculator

DC (direct current) power is simply amps times volts. AC single-phase power also depends on the power factor, since voltage and current can be slightly out of sync. AC three-phase power uses three alternating currents and needs an extra √3 (about 1.732) factor in the formula, it's common in industrial equipment and larger electrical installations.

Power factor measures how efficiently AC current is being converted into usable power, from 0 to 1. A purely resistive load (like an incandescent bulb or heater) has a power factor of 1. Motors and other inductive loads typically run lower, often around 0.8, meaning more current is needed to deliver the same real power.

It comes from the phase relationship between the three alternating currents, which are offset by 120 degrees from each other. This factor (√3 ≈ 1.732) is a standard, fixed constant in the three-phase power formula, not something you need to calculate yourself.

Yes, switch to "Find Amps" and enter watts and voltage (and power factor for AC) instead, the same formulas are simply solved for current instead of power.

This calculator uses line-to-line voltage (the voltage measured between any two of the three phase wires), which is the standard way three-phase equipment is typically rated and how most electricians and datasheets specify it.