Quick answer: 1 Kilocalorie (kcal) in Kilojoule
1 kcal equals 4.184 kJ. To convert Kilocalorie (kcal) to Kilojoule, multiply by 4.184 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 Kilocalorie (kcal) in Kilojoule?
- Multiply 1 by the conversion factor 4.184
- 1 Kilocalorie (kcal) = 4.184 Kilojoule
How much is 5 Kilocalorie (kcal) in Kilojoule?
- Multiply 5 by the conversion factor 4.184
- 5 Kilocalorie (kcal) = 20.92 Kilojoule
How much is 25 Kilocalorie (kcal) in Kilojoule?
- Multiply 25 by the conversion factor 4.184
- 25 Kilocalorie (kcal) = 104.6 Kilojoule
Quick Conversion Reference Table
| Kilocalorie (kcal) (kcal) | Kilojoule (kJ) |
|---|---|
| 1 kcal (Kilocalorie (kcal)) | 4.184 kJ (Kilojoule) |
| 2 kcal (Kilocalorie (kcal)) | 8.368 kJ (Kilojoule) |
| 5 kcal (Kilocalorie (kcal)) | 20.92 kJ (Kilojoule) |
| 10 kcal (Kilocalorie (kcal)) | 41.84 kJ (Kilojoule) |
| 20 kcal (Kilocalorie (kcal)) | 83.68 kJ (Kilojoule) |
| 50 kcal (Kilocalorie (kcal)) | 209.2 kJ (Kilojoule) |
| 100 kcal (Kilocalorie (kcal)) | 418.4 kJ (Kilojoule) |
| 500 kcal (Kilocalorie (kcal)) | 2092 kJ (Kilojoule) |
| 1000 kcal (Kilocalorie (kcal)) | 4184 kJ (Kilojoule) |
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FAQ
How much is 1 Kilocalorie (kcal) in Kilojoule?
1 Kilocalorie (kcal) = 4.184 Kilojoule.
How do I convert Kilocalorie (kcal) to Kilojoule?
Enter your value in Kilocalorie (kcal) into the converter above and the result in Kilojoule appears instantly. 1 kcal equals 4.184 kJ — just multiply your value by 4.184.
What is the formula for Kilocalorie (kcal) to Kilojoule?
The formula is: value in Kilojoule = value in Kilocalorie (kcal) × 4.184. For example, 5 kcal × 4.184 = 20.92 kJ.
Is this Kilocalorie (kcal) to Kilojoule converter free and accurate?
Yes. This Kilocalorie (kcal) to Kilojoule converter is 100% free, uses the exact international conversion factor (4.184), and works on any device with no signup.
How do I convert Kilojoule back to Kilocalorie (kcal)?
To convert back, divide by 4.184 (or multiply by 0.239006). You can also use our dedicated How Many Kilocalorie (kcal) 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.