⚡ Kilocalorie to Kilojoule Converter
Convert kilocalories (kcal) to kilojoules (kJ) for food labels and nutrition. 1 kcal = 4.184 kJ.
4.184
1 kcal=4.184 kJ
Quick Reference: Kilocalorie → Kilojoule
| kcal | kJ |
|---|---|
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 5 | 20.92 |
| 10 | 41.84 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
About this conversion
EU food labels are required to show energy in both kilocalories (kcal) and kilojoules (kJ). The conversion factor is 1 kcal = 4.184 kJ — exact and defined by international agreement.
Formula
kJ = kcal × 4.184. kcal = kJ / 4.184.
Worked example
A 250 kcal chocolate bar = 250 × 4.184 = 1,046 kJ.
Common use cases
- Reading EU and Australian food labels
- Tracking diet calories in apps that use kJ
- Comparing nutrition data across regions
Frequently Asked Questions
How many kJ in 100 kcal?+
418.4 kJ.
Is kcal the same as a Calorie?+
Yes — 1 kcal equals 1 food "Calorie" with a capital C.
Why do EU labels use both?+
EU regulation (EU 1169/2011) requires energy declarations in both kJ and kcal.
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