Watts to kWh Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the power and hours of use.
- Press Calculate.
How it works
Energy (kWh) = power in watts ÷ 1,000 × hours of use.
Worked example
2,000 W for 3 hours. = 6 kWh.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.