Kilocalories to kilojoules
Type a value in kcal to get it in kJ instantly.
1,673.6kJ
That's 2× as much energy as a snack, while a meal is 1.5× more. That is 20 % of a 2,000 kcal day.
What it means
How much energy is that?
Atwater factors as used on food labels. Real foods vary a little, and fibre is often counted at 2 kcal/g or not at all.
The math
How to convert kcal to kJ
To convert kilocalories to kilojoules, multiply by 4.184.
Example: 400 kcal × 4.184 = 1,673.6 kJ.
In the other direction, 1 kJ = 0.239006 kcal.
Grams on this page are protein (4 kcal/g). Pick another nutrient above.
Every unit
That food energy in every unit
Tables
kcal to kJ conversion table
| kcal | kJ |
|---|---|
| 4 kcal | 16.736 kJ |
| 20 kcal | 83.68 kJ |
| 40 kcal | 167.36 kJ |
| 60 kcal | 251.04 kJ |
| 80 kcal | 334.72 kJ |
| 100 kcal | 418.4 kJ |
| 120 kcal | 502.08 kJ |
| 160 kcal | 669.44 kJ |
| 200 kcal | 836.8 kJ |
| 300 kcal | 1,255.2 kJ |
| 400 kcal | 1,673.6 kJ |
| 600 kcal | 2,510.4 kJ |
| 800 kcal | 3,347.2 kJ |
kJ to kcal conversion table
| kJ | kcal |
|---|---|
| 16.7 kJ | 3.9914 kcal |
| 83.7 kJ | 20.0048 kcal |
| 167 kJ | 39.914 kcal |
| 251 kJ | 59.9904 kcal |
| 335 kJ | 80.0669 kcal |
| 418 kJ | 99.9044 kcal |
| 502 kJ | 119.981 kcal |
| 669 kJ | 159.895 kcal |
| 837 kJ | 200.048 kcal |
| 1,260 kJ | 301.147 kcal |
| 1,670 kJ | 399.14 kcal |
| 2,510 kJ | 599.904 kcal |
| 3,350 kJ | 800.669 kcal |
Quick answers
Quick answers
- How many kJ is 1 kcal?
- 1 kcal is 4.184 kJ.
- How many kJ is 10 kcal?
- 10 kcal is 41.84 kJ.
- How many kJ is 400 kcal?
- 400 kcal is 1,673.6 kJ.
The units
About these units
Kilocalories (kcal)
Food Calories, as on labels.
Kilojoules (kJ)
Food energy in kJ, as on European and Australian labels.
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