Amps to Watts Calculator
Convert Amps to Watts with the formula, a worked example and a table of typical values. Working shown step by step.
Try your own numbers
Estimate only. Not engineering or safety advice. Check the result against the applicable standard and the equipment data, and have a competent engineer review it before it is relied on. Terms of use.
Open in the calculator with these values
Formula
Worked example
| Input | Value |
|---|---|
| Current | 10 A |
| Voltage | 230 V |
| Power factor | 0.9 |
| Current type | Single-phase AC |
| Voltage type (three-phase only) | Line-to-line (L-L) |
- P = 230 × 10 × 0.9 = 2,070 W
Typical values
| Current (A) | Real power (W) |
|---|---|
| 1 | 207 |
| 2 | 414 |
| 5 | 1,035 |
| 10 | 2,070 |
| 16 | 3,312 |
| 20 | 4,140 |
| 32 | 6,624 |
Other inputs are the same as in the worked example above.
Assumptions
- Single-phase AC by default; choose DC or three-phase above
- V is RMS
- DC takes the power factor as 1
Choose DC to ignore the power factor.
Frequently asked questions
How do I convert Amps to Watts?
P = k × V × I × pf; k = 1 (single-phase, DC), √3 (three-phase L-L) or 3 (three-phase L-N). Worked example: Current 10 A, voltage 230 V, power factor 0.9, current type Single-phase AC gives 2,070 W.
What do I need to enter?
Enter current, voltage, power factor and current type. Change the unit of a value with its selector and the result stays the same.
Does single-phase or three-phase change the answer?
Yes. Pick the circuit type that matches the supply. Three-phase uses √3 with the line-to-line voltage, single-phase uses the voltage as it is, and DC, where it is offered, takes the power factor as 1. The formula above shows each case.
Which power factor should I use?
Read it from the equipment nameplate or data sheet. Typical values are only a guide: about 1.0 for a resistive load and about 0.85 for a fully loaded induction motor. Do not use typical values for accurate work.
How accurate are the results?
Every figure comes from the same tested engine as the Elecmetric calculators and is meant for estimating. Check design values against the standard and the equipment data you work to.
Related
Next steps in a design: Volts to AmpsAmps to kW
Opposite direction: Watts to Amps
Also see: kVA to Watts Watts to kVA kWh to Watts Watts to kWh
Formula guides: Three-Phase Power FormulasPower Factor and the Power TriangleAC Circuit Formulas: Reactance and Impedance
All 78 conversionsAmps to Watts in Elecmetric