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