Quick answer: 1 Calorie in Kilojoule
1 cal equals 0.004184 kJ. To convert Calorie to Kilojoule, multiply by 0.004184 using the free calculator above — no signup needed.
Energy & Work units
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About Energy & Work Converter
The Energy & Work Converter converts between 7 different units, including Joule, Kilojoule, Calorie, Kilocalorie (kcal), Watt-hour (Wh). The base unit is the Joule, and every other unit on this page is defined as an exact multiple of it. Type any value into the calculator above to convert instantly — free, unlimited, no signup and nothing to install.
Common equivalents: 1 Joule = 0.001 Kilojoule, 0.239006 Calorie, 0.000239006 Kilocalorie (kcal).
Scale of this category: the smallest unit is the Joule (J) and the largest is the Kilowatt-hour (kWh) (kWh).
Last updated: 2026-09-15
Energy & Work conversion factors
| Unit | Symbol | Value in Joule |
|---|---|---|
| Joule | J | 1 J = 1 J |
| Kilojoule | kJ | 1 kJ = 1000 J |
| Calorie | cal | 1 cal = 4.184 J |
| Kilocalorie (kcal) | kcal | 1 kcal = 4184 J |
| Watt-hour (Wh) | Wh | 1 Wh = 3600 J |
| Kilowatt-hour (kWh) | kWh | 1 kWh = 3600000 J |
| BTU | BTU | 1 BTU = 1055.06 J |
Worked Examples
See exactly how the conversion works with real numbers, step by step.
How much is 1 Calorie in Kilojoule?
- Multiply 1 by the conversion factor 0.004184
- 1 Calorie = 0.004184 Kilojoule
How much is 100 Calorie in Kilojoule?
- Multiply 100 by the conversion factor 0.004184
- 100 Calorie = 0.4184 Kilojoule
How much is 1000 Calorie in Kilojoule?
- Multiply 1000 by the conversion factor 0.004184
- 1000 Calorie = 4.184 Kilojoule
Quick Conversion Reference Table
| Calorie (cal) | Kilojoule (kJ) |
|---|---|
| 1 cal (Calorie) | 0.004184 kJ (Kilojoule) |
| 2 cal (Calorie) | 0.008368 kJ (Kilojoule) |
| 5 cal (Calorie) | 0.02092 kJ (Kilojoule) |
| 10 cal (Calorie) | 0.04184 kJ (Kilojoule) |
| 20 cal (Calorie) | 0.08368 kJ (Kilojoule) |
| 50 cal (Calorie) | 0.2092 kJ (Kilojoule) |
| 100 cal (Calorie) | 0.4184 kJ (Kilojoule) |
| 500 cal (Calorie) | 2.092 kJ (Kilojoule) |
| 1000 cal (Calorie) | 4.184 kJ (Kilojoule) |
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FAQ
How much is 1 Calorie in Kilojoule?
1 Calorie = 0.004184 Kilojoule.
How do I convert Calorie to Kilojoule?
Enter your value in Calorie into the converter above and the result in Kilojoule appears instantly. 1 cal equals 0.004184 kJ — just multiply your value by 0.004184.
What is the formula for Calorie to Kilojoule?
The formula is: value in Kilojoule = value in Calorie × 0.004184. For example, 100 cal × 0.004184 = 0.4184 kJ.
Is this Calorie to Kilojoule converter free and accurate?
Yes. This Calorie to Kilojoule converter is 100% free, uses the exact international conversion factor (0.004184), and works on any device with no signup.
How do I convert Kilojoule back to Calorie?
To convert back, divide by 0.004184 (or multiply by 239.005736). You can also use our dedicated How Many Calorie in 1 Kilojoule? page for instant results.
Do I need to download an app or sign up?
No. The converter runs entirely in your browser — nothing to install, no account, no fees. It even keeps working offline once the page has loaded.
Which Energy & Work units are supported?
This converter supports 7 units: Joule, Kilojoule, Calorie, Kilocalorie (kcal), Watt-hour (Wh), Kilowatt-hour (kWh), BTU.