Kilocalories to Kilojoules Converter
1 kilocalorie = 4.184 kilojoules
Type a value in either box: the conversion between kilocalories (kcal) and kilojoules (kJ) updates instantly.
Kilojoules to Kilocalories Converter
Good to know
1 kcal is exactly 4.184 kJ (the thermochemical calorie). Food labels in the EU must show energy in both kJ and kcal per 100 g or 100 mL.
How to convert kilocalories to kilojoules
To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184. To go the other way, multiply kilojoules by 0.2390057.
kJ = kcal × 4.184
Worked examples
- 1 kcal = 4.184 kJ
- 100 kcal = 418.4 kJ
- 250 kcal = 1,046 kJ
- 2,000 kcal = 8,368 kJ
Kilocalories to Kilojoules conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 6 kcal | 25.104 kJ |
| 7 kcal | 29.288 kJ |
| 8 kcal | 33.472 kJ |
| 9 kcal | 37.656 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 30 kcal | 125.52 kJ |
| 40 kcal | 167.36 kJ |
| 50 kcal | 209.2 kJ |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
About the units
Kilocalories (kcal)
The kilocalorie (kcal) is the energy needed to heat 1 kg of water by about 1 °C. On food labels it is usually called a Calorie, with a capital C.
Kilojoules (kJ)
The kilojoule (kJ) is 1,000 joules, the SI unit of energy. Food labels in the EU, Australia and other countries show energy in both kJ and kcal.
Frequently asked questions
How do I convert kilocalories to kilojoules?
kJ = kcal × 4.184What is 100 kcal in kilojoules?
How many kilojoules are in a kilocalorie?
How many kilocalories are in a kilojoule?
Conversion factors use exact international definitions where they exist (for example 1 inch = 2.54 cm and 1 lb = 0.45359237 kg). Results are rounded for display only.