electrical calculator
Watts / Amps / Volts / kVA Calculator
Convert between apparent power (kVA), real power (kW), and horsepower for single- or three-phase loads.
How it works
kVA = V x I / 1000 (x sqrt(3) for three-phase). kW = kVA x power factor. HP = kW x 1.341.
Worked example
480 V, 100 A, three-phase, PF 1.0: kVA = 1.732 x 480 x 100 / 1000 = 83.14 kVA.
When to use it
- Three-phase multiplies by sqrt(3), about 1.732.
- A power factor of 1.0 is a purely resistive load; motors run lower.