Amps on their own don't tell you watts — you also need the voltage, because power equals voltage times current. That's exactly what Google's one-line answer can't ask you for, so set the voltage below and get the right number instead of a guess.
DC: W = V × A · AC (1-phase): W = V × A × PF · AC (3-phase): W = √3 × V × A × PF
10 A × 120 V = 1200 W
| Amps (A) | Watts (W) |
|---|---|
| 1 A | 120 W |
| 5 A | 600 W |
| 10 A | 1200 W |
| 15 A | 1800 W |
| 20 A | 2400 W |
| 30 A | 3600 W |
| 50 A | 6000 W |
| 100 A | 12000 W |
Getting watts from amps is how you size wiring, breakers, generators, inverters, and solar gear without overloading anything. The voltage you're on (12 V automotive, 120/230 V mains, 5 V USB) changes the answer several-fold, and AC loads add a power factor that DC ignores.
Size a generator or inverter for an appliance rated in amps at your mains voltage.
Check that a circuit's amp draw stays under a breaker's watt budget.
Convert a 12 V automotive or solar load between amps and watts for battery planning.
Translate a motor's nameplate amps into real watts using its power factor.
Because watts = volts × amps. Amps measure current; watts measure power, which is current multiplied by the voltage it flows at. Without a voltage there is no single correct answer — the same 5 A is 60 W at 12 V but 600 W at 120 V.
For a DC or resistive load, 15 A × 120 V = 1,800 W. For an AC load you multiply by the power factor, so at PF 0.85 it would be about 1,530 W.
DC uses W = V × A. Single-phase AC adds power factor: W = V × A × PF. Three-phase AC uses line-to-line voltage: W = √3 × V × A × PF. Pick the mode that matches your system above.
Use 1.0 for DC, heaters and incandescent lighting; around 0.9–0.95 for modern power supplies and LED drivers; roughly 0.8–0.85 for typical motors, and lower for lightly loaded ones. When in doubt, check the device nameplate.
Unitly.fyi · results update live — set your own voltage and power factor above.