kVA to Amps Three Phase Converter
Convert kVA to amps, or amps to kVA, on a three phase supply. Enter the line-to-line voltage and get the current instantly, with kW from power factor and the working shown.
Convert kVA to Amps
Pick a direction, enter your value and the line-to-line voltage, and the converter does the three phase maths. Add a power factor if you also want the real power in kW.
Three Phase kVA and Amps Calculator
Convert in either direction using the √3 formula.
How the Conversion Works
The three phase formulas behind the result
kVA to Amps
Amps = kVA × 1,000 ÷ (√3 × V). At 415V, 100 kVA gives 100,000 ÷ (1.732 × 415), which is about 139.1 A.
Amps to kVA
kVA = √3 × V × amps ÷ 1,000. At 415V, 100 A gives 1.732 × 415 × 100 ÷ 1,000, which is about 71.9 kVA.
Use Line-to-Line Voltage
Three phase formulas use the voltage between two phases, not the phase-to-neutral voltage. Phase-to-neutral is the line voltage divided by 1.732.
Add Power Factor for kW
kW = kVA × power factor. The power factor does not change the amps for a given kVA, only how much of it is real power.
kVA to Amps Chart
Line current in amps for common kVA ratings on a three phase supply at 400V, 415V and 480V.
| kVA | Amps at 400V | Amps at 415V | Amps at 480V |
|---|---|---|---|
| 5 kVA | 7.22 A | 6.96 A | 6.01 A |
| 10 kVA | 14.43 A | 13.91 A | 12.03 A |
| 15 kVA | 21.65 A | 20.87 A | 18.04 A |
| 20 kVA | 28.87 A | 27.82 A | 24.06 A |
| 30 kVA | 43.30 A | 41.74 A | 36.08 A |
| 50 kVA | 72.17 A | 69.56 A | 60.14 A |
| 63 kVA | 90.93 A | 87.65 A | 75.78 A |
| 100 kVA | 144.34 A | 139.12 A | 120.28 A |
| 200 kVA | 288.68 A | 278.25 A | 240.56 A |
| 500 kVA | 721.69 A | 695.62 A | 601.41 A |
Values are rounded to two decimal places and assume a balanced three phase load. For equipment selection, always check the manufacturer’s rating and relevant wiring regulations.
kVA to Amps FAQ
Answers to the most frequently asked questions about converting kVA to amps on a three phase supply.
Multiply the kVA by 1,000, then divide by the square root of 3 (1.732) multiplied by the line-to-line voltage. For example, 100 kVA at 415V is 100,000 divided by (1.732 × 415), which gives about 139.1 amps per phase.
kVA equals the square root of 3 (1.732) multiplied by the line-to-line voltage and the current in amps, divided by 1,000. For example, 100 amps at 415V gives about 71.9 kVA.
No. kVA is apparent power, so converting between kVA and amps only needs the voltage. Power factor is only needed to convert kVA to kW, where kW equals kVA multiplied by the power factor.
Use the line-to-line voltage, which is nominally 400V in the UK, although 415V is still widely quoted and used on equipment ratings. Check the nameplate or supply details for the figure that applies to your installation.
kVA is apparent power, the total power drawn from the supply, while kW is real power, the part that does useful work. kW equals kVA multiplied by the power factor, so for a power factor of 0.8, a 100 kVA load delivers 80 kW.