Amps, kW and kVA converter
The calculator needs JavaScript. The worked example, formula and figures below show exactly how it works, so you can do the sum yourself. A guide, not advice. Check your supplier's or maker's figures before ordering.
Short answer
Worked example
| You enter | Value |
|---|---|
| Convert from | Amps |
| Supply | Single phase |
| Current | 32 A |
| Power factor | 1 |
| Voltage | 230 V |
32.00 A = 7.36 kW = 7.36 kVA
| Result | Value |
|---|---|
| Real power | 7.36 kW |
| Current | 32 A |
| Apparent power | 7.36 kVA |
Show the working
- Real power: 230 V × 32 A × 1 = 7,360 W
- Apparent power: 7.36 kW ÷ 1 = 7.36 kVA
How it works
- Single phase: P (W) = V × I × pf
- Three phase: P (W) = √3 × V_L × I × pf, where V_L is the line voltage
- Apparent power S (VA) = P ÷ pf
This converts figures; it doesn't size a cable or a device. Use the cable size calculator for that.
Our default (adjustable)
These are typical planning figures and our own allowances, not facts about your product. Change any of them in the calculator to match your bag, pack or tin.
| Figure | Our default (adjustable) | Kind | Source |
|---|---|---|---|
| Voltage: Single phase | 230 V | Our assumption Not yet checked against the source | Our choice: change it to suit your job UK nominal single-phase supply voltage (brief v2 E2). Researcher to cite the statutory source. |
| Voltage: Three phase | 400 V | Our assumption Not yet checked against the source | Our choice: change it to suit your job UK nominal three-phase line voltage (brief v2 E2). Researcher to cite the statutory source. |
Regulations and standards
- BS 7671:2018+A4:2026 (design current from power; Appendix 4)
Explained: BS 7671 (the IET Wiring Regulations).
The same arithmetic applies across the UK.