kW to kVA Calculator IEC / NEC Reference
Convert kW to kVA instantly with power factor (PF). Get accurate results for single-phase and 3-phase systems.
Quick Examples - tap to get result
⚡ Most users start with an example
Pick a typical load; we fill inputs, calculate, and scroll to the answer.
Input Parameters
Used by engineers for electrical load calculation and equipment sizing.
Tip: Adjust kW or PF to instantly update the result.
Calculation Results
Based on standard power factor assumptions used in industrial equipment sizing.
For detailed guides and examples, see our Power Factor Guides.
AI Assistant
Calculation InsightsEngineering Disclaimer
This calculator provides power conversion estimates only. For final electrical system design, equipment sizing, and power factor correction, consult a licensed electrical engineer or certified professional. Actual power requirements may vary based on detailed load analysis, harmonics, and specific application requirements.
Core formula for conversion is shown at the top of this page.
For practical sizing, try generator size calculator or transformer sizing tool.
kW to kVA Formula & 3-Phase Conversion
Example: 10 kW at 0.8 PF → 12.50 kVA. Use the calculator above for your PF and load.
When to Use This Calculator
- Generator sizing
- Transformer capacity planning
- Electrical load calculation
- Power system design
kW to kVA Formula & Explanation
- kW → kVA: divide real power by PF.
- kVA → kW: multiply apparent power by PF.
- PF is between 0 and 1; use nameplate or measured values when possible.
Deeper theory and worked examples: Power Factor Guide, kW vs kVA. For a 3-phase–focused flow, see kW to kVA (3-phase).
kVA² = kW² + kVAR²; with PF known, scalar forms above match this geometry (PF = kW ÷ kVA).
Learn More
kW to kVA Conversion Chart (Common Loads)
| Equipment | Typical PF | Example kVA |
|---|---|---|
| Induction Motor | 0.85 | 117.65 (100 kW) |
| UPS System | 0.95 | 105.26 (100 kW) |
| Transformer Load | 0.90 | 111.11 (100 kW) |
| LED Lighting | 0.98 | 102.04 (100 kW) |
| Welding Machine | 0.80 | 125.00 (100 kW) |
| Air Compressor | 0.82 | 121.95 (100 kW) |
| VFD Drive | 0.96 | 104.17 (100 kW) |
| HVAC Chiller | 0.88 | 113.64 (100 kW) |
| Distribution Panel | 0.92 | 108.70 (100 kW) |
| General Mixed Load | 0.85 | 117.65 (100 kW) |
How to Choose kVA for Generator and Transformer Sizing
Start with measured or nameplate kW, then apply realistic PF to estimate required kVA. For mixed industrial loads, validate against startup current, harmonic impact, and operating margin. A practical engineering workflow is to compute base kVA first, then add 15-25% design headroom before selecting generator or transformer capacity. This avoids undersizing and improves reliability during load variation.
Frequently Asked Questions
How do you convert kW to kVA?
Use kVA = kW ÷ PF. For practical load checks, enter your measured kW and PF in the calculator above.
What power factor should I use?
Use nameplate or measured PF first. If unavailable, start with 0.80-0.90 for motors or 0.95 for IT loads, then verify with the calculator.
Why does low PF increase kVA?
At the same kW, lower PF means more apparent power is needed. Use the calculator to compare different PF values and see required kVA instantly.