Cal to Kj ConverterRight in Your Browser
Convert calories (cal) to kilojoules (kJ). The calorie (cal) is the small scientific calorie — the heat to warm one gram of water by one degree Celsius. The kilojoule (kJ) is 1,000 joules — the energy unit on food labels in Australia, New Zealand and much of Europe. Everything is calculated locally in your browser — no server, and it works offline.
0.004184 kJ
in kilojoules (kilojoule)
To convert calories to kilojoules, multiply the calorie value by 0.004184.
Switch to Kj to CalCal to Kj Chart
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 1 | 0.004184 |
| 2 | 0.008368 |
| 3 | 0.012552 |
| 4 | 0.016736 |
| 5 | 0.02092 |
| 10 | 0.04184 |
| 20 | 0.08368 |
| 50 | 0.2092 |
| 100 | 0.4184 |
Frequently Asked Questions
How many kilojoules are in a calorie?
One calorie equals 0.004184 kilojoules (1 cal = 0.004184 kJ). So to go from calories to kilojoules, multiply the calorie value by 0.004184.
What is the formula to convert calories to kilojoules?
To convert calories to kilojoules, multiply the calorie value by 0.004184. For example, 10 cal is 0.04184 kJ.
What is 1000 calories in kilojoules?
1000 calories — one food Calorie (kcal) — is 4.184 kilojoules. The converter above works for any value, entirely in your browser.
Is the calorie to kilojoule conversion exact?
The factor used here is the defined value: 1 cal = 0.004184 kJ. Results are rounded to six significant digits for readability, so for high-precision work use the full factor. This is the thermochemical calorie, defined as exactly 4.184 J. Note that food-label "Calories" are actually kilocalories — 1,000 of these small calories.
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