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Power calculators
Watts, amps, and electrical power
- PowerOpen calculator
Watts to Amps
Convert electrical power (watts) to current (amps) at a given voltage.
- PowerOpen calculator
Amps to Watts
Convert current (amps) and voltage into power (watts).
- PowerOpen calculator
Ohm's Law Calculator
Find voltage, current, or resistance when you know any two values (V = I × R).
- PowerOpen calculator
Volts to Watts Calculator
Convert voltage and current into electrical power in watts.
- PowerOpen calculator
Watts to Volts Calculator
Find voltage from power and current (V = W ÷ A).
- PowerOpen calculator
Power Factor Calculator
Calculate power factor from real power (kW) and apparent power (kVA).