kVA to Amps Calculator
Current drawn by a load rated in kVA, for single-phase and three-phase supplies.
Results
Current
36.08
A
Current
62.50
A
Active power
22.500
kW
What this tool does
Generators, transformers and uninterruptible power supplies are rated in kVA, but cables and breakers are chosen by amps, so this conversion comes up on every installation. The active power in kW is shown as well, because that is what the load actually turns into work.
Formula
I₁φ = kVA × 1000 ÷ U · I₃φ = kVA × 1000 ÷ (√3 × U)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
s | Apparent power | kVA |
u | Voltage | V |
pf | Power factor | — |
I3 | Current | A |
I1 | Current | A |
P | Active power | kW |
Worked example
- Apparent power25 kVA
- Voltage400 V
- Power factor0.9
- Current36.08 A
- Current62.50 A
- Active power22.500 kW
Limitations
- Electrical installations are governed by national wiring rules. Cable sizing also depends on installation method, grouping, ambient temperature and protection devices, which this calculator does not evaluate.
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.