kW to kVA Calculator
Convert real power (kW) to apparent power (kVA) using the power factor. Edit either side and the other follows.
kVA = 1 kW ÷ 0.8
When to use it
Equipment is often rated in kW while generators are rated in kVA, so the two never match until you bring in the power factor. This converter sizes up from a known kW figure to the kVA a generator must supply, which is the usual direction when you are turning a load list into a set size. Mixed site loads sit around 0.8 power factor unless the nameplates say otherwise.
How it is calculated
kVA = kW / power factor. kW = kVA x power factor.
1 kW at power factor 0.8 is 1.25 kVA. 1.25 kVA at 0.8 is 1 kW.
Common conversions
| Real power (kW) | Apparent power (kVA) |
|---|---|
| 10 kW | 12.5 kVA |
| 25 kW | 31.3 kVA |
| 50 kW | 62.5 kVA |
| 100 kW | 125.0 kVA |
| 250 kW | 312.5 kVA |
| 500 kW | 625.0 kVA |
Frequently asked questions
How do you convert kW to kVA?
Divide the kW value by the power factor. For example, 1 kW at power factor 0.8 is 1.25 kVA.
How do you convert kVA back to kW?
Multiply the kVA value by the power factor. For example, 1.25 kVA at power factor 0.8 is 1 kW.
What power factor should you use?
Use the load power factor from the equipment nameplate. If unknown, 0.8 is a common assumption for mixed loads.
How big a kVA generator do my kW loads need?
Add up the kW loads and divide by the power factor to get the kVA the set must supply, then compare that against the generator rating with some headroom. The converter does the kW to kVA step for you.
What if I do not know the power factor?
Use 0.8 for a mixed site load as a starting point. Resistive loads such as heaters sit near 1.0, while motor-heavy loads can drop below 0.8, so refine the figure from the nameplates when you have them.