Amp to Watt Converter
Convert Amps to Watts (or Watts to Amps) for DC, AC single-phase and AC three-phase circuits. Add voltage and power factor for an accurate result, see the step-by-step formula, and check the reference table — all calculated instantly in your browser.
Result
0 W
W
--
kW
--
mW
--
P = V x I
Amps vs Watts at this voltage
Reference Table: Common Amp → Watt Values
Default example at 230V, AC single phase, power factor 1.0. Use the calculator above for your own voltage and circuit type.
| Amps (A) | Watts (W) | Kilowatts (kW) |
|---|---|---|
| 1 | 230 | 0.23 |
| 2 | 460 | 0.46 |
| 3 | 690 | 0.69 |
| 5 | 1150 | 1.15 |
| 10 | 2300 | 2.3 |
| 15 | 3450 | 3.45 |
| 16 | 3680 | 3.68 |
| 20 | 4600 | 4.6 |
| 25 | 5750 | 5.75 |
| 30 | 6900 | 6.9 |
| 32 | 7360 | 7.36 |
| 40 | 9200 | 9.2 |
| 50 | 11500 | 11.5 |
Frequently Asked Questions
For DC, Watts = Volts x Amps. For AC single phase, Watts = Volts x Amps x Power Factor. For AC three phase, Watts = sqrt(3) x Volts x Amps x Power Factor (line-to-line) or 3 x Volts x Amps x Power Factor (line-to-neutral).
In AC circuits, voltage and current are not always perfectly in phase. The power factor (0 to 1) accounts for that difference between real power and apparent power. For purely resistive loads it is usually close to 1.
Click the swap icon above the inputs to switch the calculator to Watts to Amps mode, then enter the power, voltage and (for AC) power factor.
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