Electrical Power Converter
Convert
Enter a value and pick the source and target units; the result updates live.
Electrical power is the rate of energy transfer, measured in watts (W). For a DC circuit, P = V·I. For AC, real power (W) differs from apparent power (VA) by the power factor.
Converting between W, mW, kW, VA and hp matters when reading a device's power rating (W), sizing a supply (kW), specifying a motor (hp), or comparing a transformer's apparent power (VA) to its real power (W).
Common applications
Reading a device's wattage; sizing a UPS in kVA; converting a motor's hp rating to watts; comparing VA and W for a power supply.
Frequently asked questions
Power is the rate of energy transfer, measured in watts (W). For DC, P = V·I.
Watts (W) is real power; volt-amperes (VA) is apparent power. For AC, W = VA × power factor. For DC or resistive loads, they're equal.
1 mechanical horsepower ≈ 745.7 W.