3-Phase Power Calculator
Calculate apparent and real power for a balanced three-phase supply.
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What this tool does
Calculate apparent and real power for a balanced three-phase supply. Voltage is line-to-line, current is line current.
How to use the 3-Phase Power Calculator
- Enter or select voltage.
- Enter or select line current (amps).
- Enter or select power factor.
- Read the calculated result; change any measurement to compare alternatives.
Formula
kVA=√3×Vline×Iline/1000; kW=kVA×PF
- voltage
- Voltage
- current
- Line current (amps)
- pf
- Power factor
Voltage is line-to-line, current is line current.
Worked example
For 3-phase power calculator, the following measurements illustrate the exact method: Voltage: 240; Line current (amps): 20; Power factor: 0.9.
Inputs
- Voltage240
- Line current (amps)20
- Power factor0.9
Result
- Real power (kW)7.48
- Apparent power (kVA)8.31
Results explained
- Real power (kW)
- Real power (kW) from the formula above. Voltage is line-to-line, current is line current.
- Apparent power (kVA)
- Apparent power (kVA) from the formula above. Voltage is line-to-line, current is line current.
Frequently asked questions
kVA=√3×Vline×Iline/1000; kW=kVA×PF
Voltage is line-to-line, current is line current.
No. Electrical and HVAC results are estimates. Installation must comply with local codes and be checked by a qualified licensed professional.
Nameplate values, conductor temperature, power factor, efficiency, weather and actual installation conditions may differ from your entered assumptions.
Confirm units, manufacturer data and the formula's assumptions, then verify sizing with the equipment instructions and applicable local standards.