kVA to kW: How Power Factor Connects Apparent and Real Power
Transformers and generators are rated in kVA, but your load does real work in kW. Power factor is the bridge between them — and misreading it leads to undersized supplies.
This article shows the conversion, the physics behind it, and how PF affects equipment sizing.
The formula
kW = kVA × Power Factor. Apparent power (kVA) is the vector sum of real power (kW) and reactive power (kVAR).
Worked example
A 100 kVA transformer feeding a load at 0.8 PF delivers only 80 kW of useful power. Improve PF to 0.95 and the same transformer frees up to 95 kW.
Why it matters
Low power factor wastes transformer capacity and can trigger utility penalties — which is why PF correction pays back quickly.
Related calculators
Frequently asked questions
Typical industrial power factor?
Most plants run 0.8–0.95 depending on the mix of motors and electronics.
Can kW exceed kVA?
No — kW is always ≤ kVA because power factor cannot exceed 1.
This guide is for educational purposes. Always verify against the relevant standard before final design.