kVA to kW Calculator (kVA ⇄ kW, kVAR & Current)

kVA is apparent power and kW is real (usable) power; the power factor links them. This calculator converts kVA to kW (or kW to kVA) using your power factor, and also returns reactive power and the full-load current.

Real power (kW) does the useful work; apparent power (kVA) is what the supply and cabling must actually carry. The ratio of the two is the power factor. Because generators, transformers and UPS units are rated in kVA, converting a kW load to kVA (dividing by power factor) is essential when sizing equipment — a 0.8 PF load needs 25% more kVA than its kW figure.

A 100 kVA supply at 0.8 power factor delivers 80 kW of real power and 60 kVAR of reactive power, drawing about 139 A on a 415 V three-phase system.

How the kVA to kW Calculator Works

Choose the conversion direction, enter the value and power factor, and the calculator returns real power (kW), apparent power (kVA), reactive power (kVAR) and — from the voltage and phase you enter — the full-load current. All results update as you type.

Why It Matters

• Size generators, transformers and UPS units on kVA, since that is how they are rated.
• A low power factor inflates the kVA and the current for the same useful kW.
• Correcting power factor (adding capacitors) reduces the kVA and current without changing the kW.