Power and Conversions
Convert between watts, amps, kW, kVA and horsepower, work Ohm’s law, and compare single-phase and three-phase supplies, with the formula shown for every result.
Tools in this group
- Amps to kW Calculator
- Enter amps, voltage and power factor to get kilowatts and kVA for a single phase, three phase or DC load.
- Amps to Watts Calculator
- Enter amps, voltage and power factor to get watts, kilowatts and VA, then the kWh and cost for the hours you run it.
- HP to kW Converter
- Convert horsepower to kilowatts for the three horsepower definitions, then find the electrical input kW and kVA of a motor.
- kVA to Amps Calculator
- Convert kVA to amps for single or three phase, or enter a transformer to get primary and secondary full-load amps.
- kVA to kW Calculator
- Multiply kVA by the power factor to get kW, or go back from kW to kVA, and see the kvar on a power triangle.
- kW to Amps Calculator
- Enter kilowatts, voltage and power factor to get the current, or use motor shaft kW with its efficiency.
- kW to HP Converter
- Convert kilowatts to horsepower with the definition you need, or turn motor output kW into input kW with efficiency.
- Ohms Law Calculator
- Enter any two of voltage, current, resistance and power to get the other two, with series and parallel resistors.
- Ohms Law Wheel
- Tap two known quantities on the wheel to see the matching formulas and the other two values calculated.
- Power Factor Calculator
- Find the power factor from kW and kVA, from volts, amps and kW, or from the phase angle, with a power triangle.
- Power Factor Correction Calculator
- Enter the load and target power factor to get the capacitor kvar, the current reduction and the kVA saved.
- Single Phase vs Three Phase Calculator
- Enter one load and see the amps, wire size, voltage drop and copper needed on a single-phase and a three-phase supply.
- Three Phase Power Calculator
- Calculate kW, kVA, kvar and line current of a three-phase load, or check the current unbalance of a motor.
- Volts to Watts Calculator
- Convert volts to watts from the current or from the resistance, and see all four Ohm's law values at once.
- Watts to Amps Calculator
- Enter watts, voltage and power factor to get the amps, then see the breaker size and the same load at other voltages.