kW to kVA Calculator
Sizing commercial backup generators and utility transformers. Calculates the total transformer or generator kVA rating required to deliver a desired kilowatt load.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Active Power (kW), Power Factor (PF) to determine Required Apparent Power (kVA). In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.
Calculates the total transformer or generator kVA rating required to deliver a desired kilowatt load.
Typical Application & Industry Guidelines
Sizing commercial backup generators and utility transformers.
kW to kVA Calculator Benchmark Lookup Table
| Load kW | kVA @ 0.70 PF | kVA @ 0.80 PF | kVA @ 0.90 PF | kVA @ 0.95 PF |
|---|---|---|---|---|
| 20 kW | 28.6 kVA | 25.0 kVA | 22.2 kVA | 21.1 kVA |
| 50 kW | 71.4 kVA | 62.5 kVA | 55.6 kVA | 52.6 kVA |
| 80 kW | 114.3 kVA | 100.0 kVA | 88.9 kVA | 84.2 kVA |
| 150 kW | 214.3 kVA | 187.5 kVA | 166.7 kVA | 157.9 kVA |
| 300 kW | 428.6 kVA | 375.0 kVA | 333.3 kVA | 315.8 kVA |