Kilowatt-hours to Joules Converter
1 kWh = 3,600,000 J. Multiply kilowatt-hours by 3,600,000 (3.6 million) to get joules. 10 kWh = 36 MJ.
Inverse conversion
1 J = 2.778×10⁻⁷ kWh. Divide joules by 3,600,000 to convert to kilowatt-hours. 1 MJ = 0.2778 kWh.
Formula
Formula
J = kWh × 3,600,000
Worked example
To convert 2.5 kWh to joules: 2.5 × 3,600,000 = 9,000,000 J.
Quick reference table
| kWh | J |
|---|---|
| 0.1 | 360000 |
| 0.5 | 1800000 |
| 1 | 3600000 |
| 2 | 7200000 |
| 5 | 18000000 |
| 10 | 36000000 |
| 25 | 90000000 |
| 50 | 180000000 |
| 100 | 360000000 |
Unit definitions
Kilowatt-hour (kWh)
A kilowatt-hour (kWh) is the energy used by a 1 kW device running for 1 hour. It is the standard unit on electricity bills worldwide.
Joule (J)
The joule (J) is the SI unit of energy, equal to 1 watt-second. 1 kWh = 3,600,000 J because 1 hour = 3,600 seconds.
Common use cases
- Electricity billing to physics conversions
- Battery capacity calculations
- HVAC energy consumption
- Solar panel output analysis