Electrical Power Calculator
Compute electrical power from voltage and current, current and resistance, or voltage and resistance.
6
Watts
Pick a formula and enter the two known values to get power in watts.
How to use
- Choose the power formula that matches your known values.
- Enter the two required values.
- Read the resulting power in watts.
Frequently asked questions
- Which formula should I use?
- Use the one matching the two values you know: V·I, I²·R, or V²/R.
- What unit is power?
- Electrical power is measured in watts (W).