How to calculate power for 3 phase?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Follow these steps for three-phase power calculation:
- Determine your line-to-line voltage (e.g., 400V, 480V)
- Measure the line current in amperes
- Identify the power factor (usually between 0.8-1.0; assume 1.0 if unknown)
- Apply the formula: kW = (√3 × V × I × PF) ÷ 1,000
For apparent power (kVA): kVA = (√3 × V × I) ÷ 1,000
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