What power factor adds
Basic calculators often multiply volts by amps only. This page also includes power factor, so AC users can distinguish apparent power in volt-amperes from real power in watts.
Example
At 230 V and 10 A with a power factor of 1, real power is 2,300 W. With a 0.8 power factor, real power is 1,840 W while apparent power remains 2,300 VA.
Common mistakes
Do not use watts alone to size wiring, breakers or electrical protection. For AC equipment, check nameplate ratings and local electrical requirements.
Limitations
Electrical systems can be dangerous. This calculator does not check breaker sizing, wiring, phase configuration, local electrical codes or manufacturer ratings.
Last reviewed: 2026-05-17