Convert Kilocalories to Kilojoules
1 kilocalorie (food calorie) = 4.184 kilojoules. Multiply the number of kilocalories by 4.184.
Kilocalories to Kilojoules table
| Kilocalories | Kilojoules |
|---|---|
| 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 |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 500 kcal | 2,092 kJ |
| 1000 kcal | 4,184 kJ |
Kilocalories to Kilojoules in your head
Multiply by 17, then divide by 4.
That lands within 2% of the exact value.
10 kcal → 42.5 kJ in your head, 41.84 kJ exactly.
About these units
The kilocalorie (food calorie) (kcal) is a specialist or regional unit of energy & work, equal to 4,184 joules.
The kilojoule (kJ) is a metric unit of energy & work, equal to 1,000 joules.
Going the other way, 1 kilojoule = 0.23900574 kilocalories. Diet calories, electricity bills in kilowatt-hours, boiler ratings in BTU and particle physics in electronvolts are all the same physical quantity. Convert energy across every scale from the atomic to the industrial.
Frequently asked
- How many kilojoules are in a kilocalorie (food calorie)?
- 1 kilocalorie (food calorie) = 4.184 kilojoules.
- How do you convert kilocalories to kilojoules?
- Multiply the number of kilocalories by 4.184.
- What is 10 kcal in kJ?
- 10 kcal = 41.84 kJ.