kVA to kW Conversion with Power Factor
The kVA to kW Converter calculates real power from apparent power using power factor. Essential for sizing generators, transformers, and UPS systems.
Formula
P (kW) = S (kVA) × PF
For three-phase: same formula (PF per phase).
Power Triangle
- kVA = apparent power
- kW = real power
- kVAR = reactive power
- PF = kW / kVA = cos φ
Common Power Factors
| Load Type | Typical PF | kW/kVA |
|---|---|---|
| Resistive (heaters) | 1.0 | 1.00 |
| Induction motors | 0.8 | 0.80 |
| Lighting (LED) | 0.9 | 0.90 |
| Old fluorescents | 0.5 | 0.50 |
Three-Phase Note
kVA rating is total. kW = kVA × PF (same for Δ or Y).
Examples
- 100 kVA, PF = 0.85 → 85 kW
- 50 kVA, PF = 0.92 → 46 kW
Applications
- Generator sizing (use 0.8 PF)
- Transformer loading
- UPS capacity
- Utility billing
Conclusion
Always derate kVA by PF for real power. Use with Power Factor Calculator and 3-Phase Load tools.