kVA, kW & Amps Calculator (3-Phase & 1-Phase)
Convert a transformer, generator or UPS rating in kVA into real power (kW), reactive power (kVAR) and line current — for three-phase or single-phase systems.
Convert between kVA, kW, kVAR and line current. For the switchgear to carry that current — incomer, busbar and distribution — send us your requirement.
Why the kVA–kW–amps relationship matters
Size the incomer & cable
Line current from the kVA rating sets the incoming breaker, the busbar and the cable for a generator, transformer or UPS feed.
kW vs kVA
Real power (kW) does the work; apparent power (kVA) is what the source must deliver. Power factor links them — a poor factor means more kVA for the same kW.
Reactive power (kVAR)
The kVAR figure shows how much capacitor correction could cut your apparent power and free up capacity — we build the APFC panel to match.
Related free calculators
kVA, kW & amps
How do you convert kVA to amps?
Three-phase: amps = kVA × 1000 ÷ (√3 × line voltage). Single-phase: amps = kVA × 1000 ÷ voltage. This tool computes it and also gives kW and kVAR.
What is the difference between kVA and kW?
kW is real (working) power; kVA is apparent power. kW = kVA × power factor. At a power factor of 1 they are equal; below that, kVA is always larger.
Why do I need the kVAR value?
kVAR is the reactive power your load draws. Correcting it with a capacitor bank lowers current and apparent power, avoiding utility penalties and releasing capacity.
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