Amps to kVA Calculator
Turn a measured current into apparent power in kVA. Enter the amps with the system voltage and phase. Apparent power does not use power factor.
When to use it
Generators, transformers, and distribution gear are rated in kVA, while the current you measure on site is in amps. This converter turns a clamp meter reading into apparent power in kVA, so you can see how much of a generator or a feeder a circuit is actually using. Because kVA is apparent power, the result does not depend on power factor.
How it is calculated
For three phase, kVA = (1.732 x volts x amps) / 1000. For single phase, drop the 1.732.
At 400 V, 100 A, three phase: kVA = (1.732 x 400 x 100) / 1000 = 69.3 kVA.
Common conversions
| Current (A) | Apparent power (kVA) |
|---|---|
| 16 A | 11.1 kVA |
| 32 A | 22.2 kVA |
| 63 A | 43.6 kVA |
| 100 A | 69.3 kVA |
| 200 A | 138.6 kVA |
| 400 A | 277.1 kVA |
Frequently asked questions
How do you convert amps to kVA?
Multiply the voltage by the current, then divide by 1000. For three phase also multiply by 1.732: kVA = (1.732 x volts x amps) / 1000.
Does amps to kVA use power factor?
No. kVA is apparent power, the full volt-amp product, so it does not use power factor. Power factor only appears when you convert to or from real power in kW.
How is amps to kVA different from amps to kW?
kVA is the total apparent power the supply must carry; kW is the real working power. kW = kVA x power factor, so amps to kW also needs the power factor while amps to kVA does not.
Why does apparent power ignore power factor?
kVA is the full volt-amp product the supply carries, before any split into working and reactive power. Power factor only describes how that apparent power divides into kW and kVAR, so it is not needed to get kVA from amps.
How does this help size a generator?
Generators are rated in kVA. Converting your measured current to kVA shows how much of a set a circuit is using, which makes it easy to check there is enough headroom before adding more load.