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Electricity Calculators

Electrical Power Calculator

Electrical power in watts from voltage, current or resistance, for DC and AC with power factor.

Enter values

Results update as you type.

Result

Real power

2,300 W

Kilowatts
2.3
Apparent power
2,300 VA
Energy per hour
2.3 kWh
Horsepower
3.0844

About the Electrical Power Calculator

Electrical power in watts from voltage, current or resistance, for DC and AC with power factor.

Also known as: watts calculator, power formula electrical, volts times amps, kw calculator, single phase power.

How to use this calculator

  1. Enter calculate from, power factor (ac) and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

P = V × I × PF = I²R = V²/R

Worked example

Using the values pre-filled in the calculator above:

  • Calculate from: Voltage and current
  • Voltage = 230 V
  • Current = 10 A
  • Power factor (AC) = 1

the calculator returns:

  • Real power: 2,300 W
  • Kilowatts: 2.3
  • Apparent power: 2,300 VA
  • Energy per hour: 2.3 kWh