Calorie to Kilojoule Converter
Convert calories to kilojoules with this free energy converter. The exact relationship used on this page is 1 calorie = 0.004184 kilojoules. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Kilojoule = Calorie × 0.004184
How to convert calories to kilojoules
- Enter the value in calories in the converter.
- Read the equivalent amount in kilojoules.
- Use the swap link if you need kilojoule to calorie instead.
- Check the table for common values without typing.
Worked examples
- 1 cal = 0.004184 kJ
- 5 cal = 0.02092 kJ
- 10 cal = 0.04184 kJ
- 25 cal = 0.1046 kJ
Conversion table
Common calories values converted to kilojoules.
| cal | kJ |
|---|---|
| 1 | 0.004184 |
| 2 | 0.008368 |
| 3 | 0.012552 |
| 4 | 0.016736 |
| 5 | 0.02092 |
| 6 | 0.025104 |
| 7 | 0.029288 |
| 8 | 0.033472 |
| 9 | 0.037656 |
| 10 | 0.04184 |
| 20 | 0.08368 |
| 50 | 0.2092 |
| 100 | 0.4184 |
| 250 | 1.046 |
| 500 | 2.092 |
| 1,000 | 4.184 |
About this conversion
Calorie (cal) and Kilojoule (kJ) are both energy units. Energy converters connect food labels (kcal), electricity bills (kWh), physics (joules), and heating (BTU). Bookmark this URL when you convert calories to kilojoules often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the kilojoule to calorie converter.
FAQ
How many kilojoules are in 1 calorie?+
1 calorie equals 0.004184 kilojoules.
What is the formula to convert calories to kilojoules?+
Kilojoule = Calorie × 0.004184
How do I convert calories to kilojoules by hand?+
Multiply the calorie value by 0.004184. Example: 10 calories × 0.004184 = 0.04184 kilojoules.
Is this cal to kJ converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.