Quick answer: 1 Joule in BTU
1 J equals 0.000947817 BTU. To convert Joule to BTU, multiply by 0.000947817 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 Joule in BTU?
- Multiply 1 by the conversion factor 0.000947817
- 1 Joule = 0.000947817 BTU
How much is 100 Joule in BTU?
- Multiply 100 by the conversion factor 0.000947817
- 100 Joule = 0.0947817 BTU
How much is 1000 Joule in BTU?
- Multiply 1000 by the conversion factor 0.000947817
- 1000 Joule = 0.947817 BTU
Quick Conversion Reference Table
| Joule (J) | BTU (BTU) |
|---|---|
| 1 J (Joule) | 0.000947817 BTU (BTU) |
| 2 J (Joule) | 0.00189563 BTU (BTU) |
| 5 J (Joule) | 0.00473909 BTU (BTU) |
| 10 J (Joule) | 0.009478169999999999 BTU (BTU) |
| 20 J (Joule) | 0.0189563 BTU (BTU) |
| 50 J (Joule) | 0.0473909 BTU (BTU) |
| 100 J (Joule) | 0.0947817 BTU (BTU) |
| 500 J (Joule) | 0.473909 BTU (BTU) |
| 1000 J (Joule) | 0.947817 BTU (BTU) |
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FAQ
How much is 1 Joule in BTU?
1 Joule = 0.000947817 BTU.
How do I convert Joule to BTU?
Enter your value in Joule into the converter above and the result in BTU appears instantly. 1 J equals 0.000947817 BTU — just multiply your value by 0.000947817.
What is the formula for Joule to BTU?
The formula is: value in BTU = value in Joule × 0.000947817. For example, 100 J × 0.000947817 = 0.0947817 BTU.
Is this Joule to BTU converter free and accurate?
Yes. This Joule to BTU converter is 100% free, uses the exact international conversion factor (0.000947817), and works on any device with no signup.
How do I convert BTU back to Joule?
To convert back, divide by 0.000947817 (or multiply by 1055.06). You can also use our dedicated How Many Joule 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.