Amps to Watts Converter
Convert current (amps) to real power (watts) for single- or three-phase supply.
Loading calculator…
What this tool does
Convert current (amps) to real power (watts) for single- or three-phase supply. Three-phase uses line-to-line voltage and assumes a balanced load. Single phase uses the two-wire supply voltage.
How to use the Amps to Watts Converter
- Enter or select current (amps).
- Enter or select voltage.
- Enter or select supply.
- Enter or select power factor.
- Read the calculated result; change any measurement to compare alternatives.
Formula
watts = amps×voltage×phase factor×power factor
- amount
- Current (amps)
- voltage
- Voltage
- phase
- Supply
- pf
- Power factor
Three-phase uses line-to-line voltage and assumes a balanced load. Single phase uses the two-wire supply voltage.
Worked example
For amps to watts converter, the following measurements illustrate the exact method: Current (amps): 20; Voltage: 240; Supply: 1; Power factor: 0.9.
Inputs
- Current (amps)20
- Voltage240
- SupplySingle phase
- Power factor0.9
Result
- Real power (watts)4,320
Results explained
- Real power (watts)
- Real power (watts) from the formula above. Three-phase uses line-to-line voltage and assumes a balanced load. Single phase uses the two-wire supply voltage.
Frequently asked questions
watts = amps×voltage×phase factor×power factor
Three-phase uses line-to-line voltage and assumes a balanced load. Single phase uses the two-wire supply voltage.
No. Electrical and HVAC results are estimates. Installation must comply with local codes and be checked by a qualified licensed professional.
Nameplate values, conductor temperature, power factor, efficiency, weather and actual installation conditions may differ from your entered assumptions.
Confirm units, manufacturer data and the formula's assumptions, then verify sizing with the equipment instructions and applicable local standards.