Energy Converter
Convert calories, joules, kilowatt-hours, BTU and more.
In other units
- Joules
- 4,184 J
- Kilojoules
- 4.184 kJ
- Megajoules
- 0.004184 MJ
- Calories (small)
- 1,000 cal
- Watt-hours
- 1.162222222 Wh
- Kilowatt-hours
- 0.0011622222 kWh
- British thermal units
- 3.965666831 BTU
- Foot-pounds
- 3,085.960033 ft·lbf
- Electronvolts
- 2.61145e+22 eV
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Common conversions
| kcal | kJ |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 1,000 | 4,184 |
| kJ | kcal |
|---|---|
| 1 | 0.239006 |
| 2 | 0.478011 |
| 5 | 1.19503 |
| 10 | 2.39006 |
| 20 | 4.78011 |
| 50 | 11.9503 |
| 100 | 23.9006 |
| 1,000 | 239.006 |
| kWh | MJ |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 50 | 180 |
| 100 | 360 |
| 1,000 | 3,600 |
| BTU | kJ |
|---|---|
| 1 | 1.05506 |
| 2 | 2.11011 |
| 5 | 5.27528 |
| 10 | 10.5506 |
| 20 | 21.1011 |
| 50 | 52.7528 |
| 100 | 105.506 |
| 1,000 | 1,055.06 |
| kWh | BTU |
|---|---|
| 1 | 3,412.14 |
| 2 | 6,824.28 |
| 5 | 17,060.7 |
| 10 | 34,121.4 |
| 20 | 68,242.8 |
| 50 | 170,607 |
| 100 | 341,214 |
| 1,000 | 3,412,140 |
Questions
Is a food Calorie the same as a calorie?
No. The Calorie on food labels (capital C) is a kilocalorie: 1,000 small calories, exactly 4.184 kJ. Labels in many countries show both kcal and kJ.
How many joules are in a kilowatt-hour?
Exactly 3.6 million (3.6 MJ). A kilowatt-hour is the energy used by a 1,000-watt device running for an hour, the unit on electricity bills.
What is a BTU?
A British thermal unit, about 1,055 joules: roughly the energy needed to heat a pound of water by 1 °F. It is used for heating and air conditioning in the US.
Is it free? Do I need an account?
It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.
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