Energy Converter
Convert energy between electrical, heat and food units. Compare electricity in kWh with gas priced per MMBtu.
Energy Converter
Convert between 12 energy units.
1 Kilowatt-hour = 3.6 Megajoule
1 kWh equals
3.6 MJ
In every unit
Energy units in practice
Electricity in Pakistan is billed per kWh (a unit), while natural gas and LNG prices are quoted per MMBtu. Converting both to the same unit shows which fuel is cheaper for a boiler, oven or generator.
Food energy on labels is given in kilocalories, often written as Calories with a capital C. One kilocalorie is 4,184 joules.
Energy unit reference
| Unit | Symbol | In joules |
|---|---|---|
| Joule | J | 1 J |
| Kilojoule | kJ | 1,000 J |
| Megajoule | MJ | 1,000,000 J |
| Watt-hour | Wh | 3,600 J |
| Kilowatt-hour | kWh | 3,600,000 J |
| Calorie | cal | 4.184 J |
| Kilocalorie | kcal | 4,184 J |
| BTU | BTU | 1,055.0559 J |
| Therm | thm | 105,505,590 J |
| MMBtu | MMBtu | 1,055,055,900 J |
| Foot-pound | ft·lbf | 1.3558179 J |
| Electronvolt | eV | 1.6021766 × 10⁻¹⁹ J |
Frequently asked questions
How many joules are in a kWh?
Exactly 3,600,000 joules (3.6 MJ): 1,000 watts for 3,600 seconds.
How many kWh are in an MMBtu?
One MMBtu (one million BTU) is about 293.07 kWh.
What is the difference between a calorie and a kilocalorie?
A kilocalorie is 1,000 calories. Food labels use kilocalories but often call them Calories.
Is a kWh a unit of power or energy?
Energy. A kilowatt is power, the rate of use, and a kilowatt-hour is the energy used by 1 kW running for one hour.