kW to kVA Calculator
Convert kW to kVA at any power factor — or kVA back to kW. WattSimple also gives the reactive power, the current at your system voltage, and the next standard generator size up, since gensets are quoted in kW but built to a 0.8 power factor.
Generator sets are quoted in kW but built to a 0.8 power factor, so a 100 kW genset is a 125 kVA machine. Leaving the slider at 0.80 gives you the manufacturer's own convention.
Apparent power
100 kVA
- Real power
- 80 kW
- Apparent power
- 100 kVA
- Reactive power
- 60 kVAR
- Current @ 240V 1ø
- 416.7 A
Next standard generator size
80 kW genset (about 100 kVA at the standard 0.8 PF rating) — 0% headroom over the 80 kW load.
A steady-state figure only. Motor starting inrush, step-load acceptance, and altitude and temperature derating all push the required size up. Size a real standby system with the manufacturer and NEC Article 702 (or 700 for emergency systems).
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This tool's methodology and data follow US standards and authoritative public datasets: