Watts to Amps Calculator — DC, AC Single-Phase, Three-Phase
CalculatorA watts to amps calculator finds current (A) from power (W), voltage (V), and power factor (PF) for DC, AC single-phase, and AC three-phase circuits.
What is it
Current equals power divided by voltage. For DC, I = P / V is enough; for AC, only real power does work, so you also divide by the power factor, and three-phase circuits divide by √3 times the line-to-line voltage. Enter line-to-line voltage (for example 380V or 480V) for three-phase. If the power factor is unknown, use 1 for resistive loads and 0.8-0.9 for motors as a reference.
How to use
- 1Pick the circuit type: DC, AC single-phase, or AC three-phase.
- 2Enter power (W) and voltage (V); for AC also enter the power factor.
- 3Press calculate to get the current in amps.
Reference
| Power | Condition | Current |
|---|---|---|
| 1,000W | DC 12V | 83.33A |
| 1,000W | AC 1-phase 220V, PF 0.9 | 5.05A |
| 10,000W | AC 3-phase 380V, PF 0.9 | 16.88A |
Sources & standards
FAQ
How many amps is 1,000 watts?
On AC single-phase 220V with power factor 1, I = 1000 / 220 ≈ 4.55A; with power factor 0.9 it is about 5.05A. On 120V it is about 8.33A at PF 1.
Why does the calculator ask for power factor?
In AC circuits the power factor is the ratio of real power to apparent power, so a lower power factor means more current for the same watts. Use 1 for resistive loads and 0.8-0.9 for motors.
Is watts to amps input sent to a server?
No. This calculator runs in your browser and does not send input to a server.