Calculators

Electrical Power Calculator

Solve watts, volts, amps and ohms from any two values, plus energy cost.

Calculators

Local only

Voltage (V)Current (A)Resistance (Ω)Power (W)Hours of use (optional)Price per kWh (optional)

Everything stays in your browser

Your text is processed on your device — nothing is uploaded to a server.

How it works

Uses P = V × I and Ohm's law V = I × R.

Good to know

How do I use it?

Fill in the options and press “Calculate”. Check the result, then copy or download it.

How does it work?

Uses P = V × I and Ohm's law V = I × R.

Is my data uploaded?

No. Everything is processed in your browser and nothing is sent to a server. No account is needed.