kW to kVA Calculator
Convert Real Power (kW) to Apparent Power (kVA). Determine the true generator size needed for your equipment.
Power Details
Apparent Power
Reactive Power
-- kVAR
Amperage
-- Amps
Power Triangle Visualization
Common Generator Sizes
| Real Power (kW) | Apparent Power (kVA) @ 0.8 PF | Est. Amps (240V, 1-Phase) | Est. Amps (480V, 3-Phase) |
|---|---|---|---|
| 10 kW | 12.5 kVA | 52 A | 15 A |
| 20 kW | 25 kVA | 104 A | 30 A |
| 30 kW | 37.5 kVA | 156 A | 45 A |
| 50 kW | 62.5 kVA | 260 A | 75 A |
| 100 kW | 125 kVA | 521 A | 150 A |
| 200 kW | 250 kVA | 1042 A | 300 A |
How to Convert kW to kVA
Generators and transformers are often rated in kVA (Apparent Power), while the engines or motors they power are rated in kW (Real Power). To properly size a generator, you must account for the system's inefficiency, represented by the Power Factor (PF).
The Formula
kVA = kW / PF
Where:
- kW (Kilowatts): Real power doing useful work.
- PF (Power Factor): Efficiency ratio (0.0 to 1.0). Standard for generators is 0.8.
- kVA (Kilovolt-Amps): The total load on the generator windings.
Example: You have a 100 kW load with a power factor of 0.8.
Calculation: 100 kW / 0.8 = 125 kVA. You need a 125 kVA generator.
What is Reactive Power (kVAR)?
In the "Power Triangle" visualization above, kVAR is the vertical side. It represents power that bounces back and forth between the source and the load to create magnetic fields (in motors/transformers). It doesn't do "real" work, but the generator still has to supply it.