Joules to Calories Converter
Convert joules to kilocalories (food Calories) instantly. Type a value, change either unit, or press swap to go the other way. 1 joule = 0.0002390057 kilocalories (food Calories).
1 joule = 0.0002390057 kilocalories (food Calories)
How to convert joules to kilocalories (food Calories)
kilocalories (food Calories) = joules × 0.0002390057
To convert joules to kilocalories (food Calories), multiply the value by 0.0002390057. To go back from kilocalories (food Calories) to joules, divide by the same number (or multiply by 4,184).
Worked examples
- 4,184 J: 4,184 × 0.0002390057 = 1 kcal
- 10,000 J: 10,000 × 0.0002390057 = 2.3900574 kcal
- 50,000 J: 50,000 × 0.0002390057 = 11.950287 kcal
Divide joules by 4,184 to get food Calories. 1 kcal is 4,184 J, so 10,000 J is about 2.4 kcal.
Joules to Calories conversion table
Joules to Kilocalories
| J | kcal |
|---|---|
| 100 | 0.023900574 |
| 1,000 | 0.23900574 |
| 4,184 | 1 |
| 10,000 | 2.3900574 |
| 50,000 | 11.950287 |
| 100,000 | 23.900574 |
| 500,000 | 119.50287 |
| 1,000,000 | 239.00574 |
| 8,368,000 | 2,000 |
| 10,000,000 | 2,390.0574 |
Kilocalories to Joules
| kcal | J |
|---|---|
| 100 | 418,400 |
| 1,000 | 4,184,000 |
| 4,184 | 17,505,856 |
| 10,000 | 41,840,000 |
| 50,000 | 209,200,000 |
| 100,000 | 418,400,000 |
| 500,000 | 2,092,000,000 |
| 1,000,000 | 4,184,000,000 |
| 8,368,000 | 35,011,712,000 |
| 10,000,000 | 41,840,000,000 |
Energy equivalents
See how one joule and one kilocalorie (food Calorie) compare with every other energy unit on the site.
1 joule equals
| Unit | Value |
|---|---|
| kilojoules (kJ) | 0.001 |
| calories (small) (cal) | 0.2390057 |
| kilocalories (food Calories) (kcal) | 0.0002390057 |
| watt-hours (Wh) | 0.0002777778 |
| kilowatt-hours (kWh) | 2.777778 × 10-7 |
| British thermal units (BTU) | 0.0009478171 |
1 kilocalorie (food Calorie) equals
| Unit | Value |
|---|---|
| joules (J) | 4,184 |
| kilojoules (kJ) | 4.184 |
| calories (small) (cal) | 1,000 |
| watt-hours (Wh) | 1.162222 |
| kilowatt-hours (kWh) | 0.001162222 |
| British thermal units (BTU) | 3.965667 |
When you need to convert joules to kilocalories (food Calories)
Physics problems and lab equipment give energy in joules, while nutrition and diet planning use Calories (kilocalories). Converting shows how a scientific energy figure relates to food energy, for example how much energy it takes to heat water compared with a snack.
About the units
Joule (J)
The joule is the SI unit of energy: the work done by a force of one newton over one meter. A small apple lifted one meter takes about one joule.
Kilocalorie (food Calorie) (kcal)
A kilocalorie is 1,000 small calories, or 4,184 joules. The "Calories" on food labels are actually kilocalories.
Frequently asked questions
How do I convert joules to kilocalories (food Calories)?
Multiply the number of joules by 0.0002390057. For example, 10 joules × 0.0002390057 = 0.0023900574 kilocalories (food Calories).
How many kilocalories (food Calories) are in one joule?
There are 0.0002390057 kilocalories (food Calories) in one joule.
How many joules are in one kilocalorie (food Calorie)?
There are 4,184 joules in one kilocalorie (food Calorie).
Is the answer in small calories or kilocalories?
This converter shows kilocalories, the "Calories" on food labels. To get small calories, choose "calorie (small)" in the To menu, or multiply the result by 1,000.
Can I convert other energy units with this tool?
Yes. Use the From and To drop-downs in the converter to choose any energy unit, or press the swap button to reverse the conversion. All calculations use internationally defined conversion factors.