Amps to Watts Calculator
Convert amps to watts free — enter current, voltage and power factor for DC, single-phase or three-phase AC. 10A at 230V (PF 0.9) = 2,070W.
About the Amps to Watts Calculator
This free amps to watts calculator turns current into power for any supply type: DC (P = I × V), single-phase AC (P = I × V × PF) and three-phase AC (P = I × V × PF × √3). Enter amps and volts, pick the current type, and watts plus kilowatts appear instantly.
It answers practical sizing questions: what load a 13 A plug can carry at 230 V (about 2.7 kW at PF 0.9), whether a 10 A circuit breaker can handle your appliances, how much power a solar inverter's 32 A output represents, or what a generator's amp rating means in watts. Voltage defaults to 230 V as used in Pakistan, Europe and most of Asia — switch to 120 V for US circuits.
A live table shows 1–15 A converted at your chosen voltage and power factor, matching the ratings printed on breakers, fuses and extension leads.
How to Use the Amps to Watts Calculator
- 1Enter the current in amps and your supply voltage (230 V default).
- 2Choose DC, single-phase AC or three-phase AC — and set the power factor for AC.
- 3Read the result in watts and kilowatts instantly.
- 4Use the 1–15 A table to check common breaker and fuse ratings.
Frequently Asked Questions
How many watts is 10 amps at 230 volts?
For a resistive DC or PF-1 load, 10 A × 230 V = 2,300 W. For typical single-phase AC appliances at power factor 0.9, it's 10 × 230 × 0.9 = 2,070 W. At 120 V (US), 10 A gives 1,200 W (PF 1) or 1,080 W (PF 0.9).
What is the amps to watts formula?
DC: watts = amps × volts. Single-phase AC: watts = amps × volts × power factor. Three-phase AC: watts = amps × volts (line-to-line) × PF × √3 (1.732). The power factor accounts for AC current and voltage being out of phase in motors and electronics.
How many watts can a 13 amp plug handle?
At 230 V a 13 A plug carries up to 13 × 230 = 2,990 W for resistive loads like heaters and kettles — commonly stated as 3 kW. With a 0.9 power factor the usable real power is about 2,691 W.
What power factor should I use?
Use 1.0 for purely resistive loads (heaters, kettles, incandescent bulbs), 0.9 for general household mixes and modern electronics, and 0.8 or lower for motors, old fluorescent lighting and compressors. When unsure, 0.9 is a sensible default.
How many watts is 20 amps three-phase at 400 V?
P = 20 × 400 × 0.9 × 1.732 = 12,470 W, or about 12.5 kW. Three-phase delivers √3 times more power than single-phase at the same line current, which is why workshops and large AC units use it.