kcal to kJ – convert kilocalories to kilojoules
Convert kcal to kJ (kilocalories to kilojoules) to match food labels, gym machines and scientific energy units. This page links to the main energy converter with kcal → kJ pre-selected for you.
Open the interactive kcal → kJ converter:
Use main converter (kcal → kJ) or switch to kJ → kcalType any number of kilocalories (kcal) on the homepage and you’ll instantly see the result in kilojoules (kJ), with a clear equation and a shareable link.
Quick reference: kcal to kJ
The exact factor is 1 kcal = 4.184 kJ. Here are some common kilocalorie values converted to kilojoules:
| Energy (kcal) | Energy (kJ, approx.) |
|---|---|
| 50 kcal | 209 kJ |
| 100 kcal | 418 kJ |
| 200 kcal | 837 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
Why convert kilocalories to kilojoules?
People often convert kcal to kJ when they:
- Read food packaging that lists energy in kilojoules only.
- Compare calorie counts on US sites (kcal) with EU or Australian labels (kJ).
- Use gym equipment that logs energy in a different unit to their meal tracker.
- Do science or engineering work that prefers joules or kilojoules.
Related energy converters on this site
On the homepage, all energy units convert via joules (J) as a base unit. That keeps conversions consistent between kcal, kJ, J, Wh, kWh, BTU and more.