Energy Converter
Joules, calories, kilowatt-hours, BTU and electronvolts. The food “Calorie” is the kilocalorie (thermochemical, 4.184 kJ).
4.184 kJ
1 kcal = 4.184 kJ
1 kilocalorie in every energy unit
joule4,184 J
kilojoule4.184 kJ
calorie1,000 cal
watt-hour1.1622222 Wh
kilowatt-hour0.0011622222 kWh
BTU (IT)3.9656668 BTU
electronvolt2.6114474×10^22 eV
kilocalorie to kilojoule table
| kilocalorie (kcal) | kilojoule (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
Units and factors
| Unit | Symbol | In joules |
|---|---|---|
| joule | J | 1 |
| kilojoule | kJ | 1,000 |
| calorie | cal | 4.184 |
| kilocalorie | kcal | 4,184 |
| watt-hour | Wh | 3,600 |
| kilowatt-hour | kWh | 3,600,000 |
| BTU (IT) | BTU | 1,055.055853 |
| electronvolt | eV | 1.602176634×10^−19 |
Questions people ask
How do I convert kilocalories to kilojoules?
Multiply by 4.184. For example 10 kcal = 41.84 kJ.
What is the base unit for energy?
The converter uses the joule as its internal base. Every unit is converted to joules and then to the target unit, so any pair of units works.
Where do the conversion factors come from?
From the legal definitions published in NIST Special Publication 811 and the SI Brochure (BIPM). Where a unit is defined exactly, the factor is exact.