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Electrical Power Calculator (P = V × I)

Find electrical power from voltage and current.

Last updated: 25 Aug 2026

Quick answer

Electrical power is P = V × I. For example, 230 volts at 5 amps is 1,150 watts. Enter the voltage and current above to find the power.

Find electrical power in watts: P = V × I. Enter the voltage and current below.

How to calculate electrical power

  1. 1 Enter the voltage in volts.
  2. 2 Enter the current in amps.
  3. 3 We compute power P = V × I.

Frequently asked questions

What is the power formula?
Power (watts) = voltage (V) × current (A).
How do I get power from resistance?
You can also use P = I²R or P = V²/R.
How many watts in a kilowatt?
One kilowatt equals 1,000 watts.

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