Electrical Power Calculator
Calculate Power from Voltage and Current
Calculate Power from Current and Resistance
Calculate Power from Voltage and Resistance
Power Formulas
- P = V × I (Power = Voltage × Current)
- P = I² × R (Power = Current² × Resistance)
- P = V² / R (Power = Voltage² / Resistance)
Common Power Units
1 kilowatt (kW) = 1,000 watts
1 megawatt (MW) = 1,000,000 watts
1 horsepower (hp) ≈ 746 watts