📏 Joules to Kilocalories Converter
Convert joules (J) to kilocalories (kcal) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 joule (J) = 0.0002390057 kilocalories (kcal). Formula: kcal = J × 0.0002390057.
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Joules to Kilocalories Converter inputs
Result
Joules to Kilocalories conversion table
| Joules (J) | Kilocalories (kcal) |
|---|---|
| 0.1 J | 0.0000239006 kcal |
| 0.5 J | 0.0001195029 kcal |
| 1 J | 0.0002390057 kcal |
| 2 J | 0.0004780115 kcal |
| 3 J | 0.0007170172 kcal |
| 5 J | 0.0011950287 kcal |
| 10 J | 0.0023900574 kcal |
| 20 J | 0.0047801147 kcal |
| 25 J | 0.0059751434 kcal |
| 50 J | 0.011950287 kcal |
| 100 J | 0.023900574 kcal |
| 1,000 J | 0.23900574 kcal |
Other energy conversions
How to convert joules to kilocalories
Multiply the number of joules by 0.0002390057 to get kilocalories: kcal = J × 0.0002390057.
Example: 5 J = 0.0011950287 kcal.
The joule (J) and the kilocalorie (food calorie) (kcal) are both units of energy. Need the opposite direction? Use the kcal to J converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many kilocalories are in a joule?
1 joule = 0.0002390057 kilocalories.
How do I convert joules to kilocalories?
Use the formula kcal = J × 0.0002390057. For example, 5 J = 0.0011950287 kcal.
How do I convert kilocalories back to joules?
1 kilocalorie (food calorie) = 4,184 joules. Use the kcal to J converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.