kVA to kW Calculator
Convert between apparent power (kVA) and real power (kW) 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 moves between them in either direction, which helps when you are checking whether a kVA set covers a list of kW loads, or sizing up from a known kW figure. Mixed site loads sit around 0.8 power factor unless the nameplates say otherwise.
How it is calculated
kW = kVA x power factor. kVA = kW / power factor.
1.25 kVA at power factor 0.8 is 1 kW. 1 kW at 0.8 is 1.25 kVA.
Common conversions
| Apparent power (kVA) | Real power (kW) |
|---|---|
| 10 kVA | 8.0 kW |
| 25 kVA | 20.0 kW |
| 50 kVA | 40.0 kW |
| 100 kVA | 80.0 kW |
| 250 kVA | 200.0 kW |
| 500 kVA | 400.0 kW |
Frequently asked questions
How do you convert kVA to kW?
Multiply the kVA value by the power factor. For example, 1.25 kVA at power factor 0.8 is 1 kW.
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.
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.
Will a kVA generator cover my list of kW loads?
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.