Quick answer: 1 Calorie in BTU
1 cal equals 0.00396567 BTU. To convert Calorie to BTU, multiply by 0.00396567 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 BTU?
- Multiply 1 by the conversion factor 0.00396567
- 1 Calorie = 0.00396567 BTU
How much is 100 Calorie in BTU?
- Multiply 100 by the conversion factor 0.00396567
- 100 Calorie = 0.396567 BTU
How much is 1000 Calorie in BTU?
- Multiply 1000 by the conversion factor 0.00396567
- 1000 Calorie = 3.965667 BTU
Quick Conversion Reference Table
| Calorie (cal) | BTU (BTU) |
|---|---|
| 1 cal (Calorie) | 0.00396567 BTU (BTU) |
| 2 cal (Calorie) | 0.00793133 BTU (BTU) |
| 5 cal (Calorie) | 0.0198283 BTU (BTU) |
| 10 cal (Calorie) | 0.0396567 BTU (BTU) |
| 20 cal (Calorie) | 0.0793133 BTU (BTU) |
| 50 cal (Calorie) | 0.198283 BTU (BTU) |
| 100 cal (Calorie) | 0.396567 BTU (BTU) |
| 500 cal (Calorie) | 1.982833 BTU (BTU) |
| 1000 cal (Calorie) | 3.965667 BTU (BTU) |
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How to Use This Converter
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FAQ
How much is 1 Calorie in BTU?
1 Calorie = 0.00396567 BTU.
How do I convert Calorie to BTU?
Enter your value in Calorie into the converter above and the result in BTU appears instantly. 1 cal equals 0.00396567 BTU — just multiply your value by 0.00396567.
What is the formula for Calorie to BTU?
The formula is: value in BTU = value in Calorie × 0.00396567. For example, 100 cal × 0.00396567 = 0.396567 BTU.
Is this Calorie to BTU converter free and accurate?
Yes. This Calorie to BTU converter is 100% free, uses the exact international conversion factor (0.00396567), and works on any device with no signup.
How do I convert BTU back to Calorie?
To convert back, divide by 0.00396567 (or multiply by 252.164401). You can also use our dedicated How Many Calorie in 1 BTU? 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.