Watts Volts Amps Calculator

Enter two electrical power values and an optional power factor to solve the third.

Watts (W)

Volts (V)

Amps (A)

System

Power factor

Rule

Enter exactly two of watts, volts, and amps. For AC, real power uses the selected power factor.

—Ready

—Real power

—Apparent power

—Reactive magnitude

—V/I ratio

Educational magnitude calculator only. Balanced three-phase uses √3 × V(line-line) × I × PF. Do not use this page for installation, conductor, breaker, or protection-device sizing.

How to use this Watts Volts Amps Calculator

Convert between watts, volts, and amps for DC or simple AC power calculations. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.