Quick answer: 1 BTU in Joule
1 BTU equals 1055.06 J. To convert BTU to Joule, multiply by 1055.06 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 BTU in Joule?
- Multiply 1 by the conversion factor 1055.06
- 1 BTU = 1055.06 Joule
How much is 5 BTU in Joule?
- Multiply 5 by the conversion factor 1055.06
- 5 BTU = 5275.28 Joule
How much is 25 BTU in Joule?
- Multiply 25 by the conversion factor 1055.06
- 25 BTU = 26376.4 Joule
Quick Conversion Reference Table
| BTU (BTU) | Joule (J) |
|---|---|
| 1 BTU (BTU) | 1055.06 J (Joule) |
| 2 BTU (BTU) | 2110.11 J (Joule) |
| 5 BTU (BTU) | 5275.28 J (Joule) |
| 10 BTU (BTU) | 10550.56 J (Joule) |
| 20 BTU (BTU) | 21101.12 J (Joule) |
| 50 BTU (BTU) | 52752.79 J (Joule) |
| 100 BTU (BTU) | 105505.59 J (Joule) |
| 500 BTU (BTU) | 527527.93 J (Joule) |
| 1000 BTU (BTU) | 1055055.85 J (Joule) |
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How to Use This Converter
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FAQ
How much is 1 BTU in Joule?
1 BTU = 1055.06 Joule.
How do I convert BTU to Joule?
Enter your value in BTU into the converter above and the result in Joule appears instantly. 1 BTU equals 1055.06 J — just multiply your value by 1055.06.
What is the formula for BTU to Joule?
The formula is: value in Joule = value in BTU × 1055.06. For example, 5 BTU × 1055.06 = 5275.28 J.
Is this BTU to Joule converter free and accurate?
Yes. This BTU to Joule converter is 100% free, uses the exact international conversion factor (1055.06), and works on any device with no signup.
How do I convert Joule back to BTU?
To convert back, divide by 1055.06 (or multiply by 0.000947817). You can also use our dedicated How Many BTU 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.