Amps to watts calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- P = I × V = 10 × 120 = 1,200.
| Inputs | Answer |
|---|---|
| Current: 10; Voltage: 120; Circuit: DC (or AC at power factor 1, single phase); Power factor: 0.9 | 10 A at 120 V is 1,200 watts. |
| Current: 16; Voltage: 230; Circuit: AC single phase with a power factor; Power factor: 0.95 | 16 A at 230 V is 3,496 watts. |
| Current: 32; Voltage: 400; Circuit: AC three phase (line voltage) with a power factor; Power factor: 0.9 | 32 A at 400 V is 19,953.2 watts. |
How to use it
For DC, watts = amps × volts: 10 A at 120 V is 1,200 W. For single-phase AC multiply also by the power factor, and for three-phase AC by √3 × line voltage × power factor.
The kilowatt figure is shown too, which is what electricity is billed in per hour (kWh).
Frequently asked questions
How do I convert amps to watts?
Multiply amps by volts (and power factor for AC).
How many watts is 10 amps at 120 volts?
1,200 watts.
How many kilowatts is that?
1.2 kW.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
Written by Calculators Free Editorial Team · Data checked 2026-11-12
About · How we verify this · Editorial policy · Corrections
About · How we verify this · Editorial policy · Corrections
General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.