Amps to Watts Converter
Convert amps to watts using voltage. Calculate power consumption from current and voltage for any electrical device.
Amps to Watts Formula
Power in watts = current × voltage: W = A × V. This is a direct application of Ohm's Law for power.
Common examples at 120 V:
- 1 A = 120 W
- 5 A = 600 W
- 10 A = 1200 W
- 15 A = 1800 W
- 20 A = 2400 W
Understanding Electrical Power
When you know the current draw (amps) of a device and the supply voltage, you can calculate power consumption. This is useful for sizing generators, solar systems, and understanding electricity bills. Multiply watts by hours used to get watt-hours (Wh) of energy consumed.
AC Power Factor
For AC circuits with reactive loads (motors, compressors), true power = V × A × power factor (PF). Most household appliances have a PF close to 1. Industrial motors may have PF of 0.7–0.9, meaning actual power is lower than V × A (apparent power).
Frequently Asked Questions
How do I convert amps to watts?
Multiply amps by voltage: W = A × V. Example: 5 A × 230 V = 1150 W.
How many watts is 15 amps at 120 volts?
15 × 120 = 1800 watts.
How many amps does a 1000W device draw at 240V?
1000 ÷ 240 = 4.17 amps.
Amps to Watts Reference Table
Wattage = Amps × Volts. Use this reference for common amperage and voltage combinations. Always consult an electrician for home wiring projects.
| Amperage | Voltage | Wattage |
|---|---|---|
| 1 A | 120 V (US) | 120 W |
| 1 A | 230 V (EU) | 230 W |
| 2 A | 120 V | 240 W |
| 5 A | 120 V | 600 W |
| 5 A | 230 V | 1150 W |
| 10 A | 120 V | 1200 W |
| 10 A | 230 V | 2300 W |
| 13 A | 230 V (UK) | 2990 W |
| 15 A | 120 V | 1800 W |
| 20 A | 120 V | 2400 W |
| 20 A | 230 V | 4600 W |
| 30 A | 240 V | 7200 W |