Quick answer: 1 BTU in Kilojoule
1 BTU equals 1.055056 kJ. To convert BTU to Kilojoule, multiply by 1.055056 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 Kilojoule?
- Multiply 1 by the conversion factor 1.055056
- 1 BTU = 1.055056 Kilojoule
How much is 5 BTU in Kilojoule?
- Multiply 5 by the conversion factor 1.055056
- 5 BTU = 5.275279 Kilojoule
How much is 25 BTU in Kilojoule?
- Multiply 25 by the conversion factor 1.055056
- 25 BTU = 26.376396 Kilojoule
Quick Conversion Reference Table
| BTU (BTU) | Kilojoule (kJ) |
|---|---|
| 1 BTU (BTU) | 1.055056 kJ (Kilojoule) |
| 2 BTU (BTU) | 2.110112 kJ (Kilojoule) |
| 5 BTU (BTU) | 5.275279 kJ (Kilojoule) |
| 10 BTU (BTU) | 10.550559 kJ (Kilojoule) |
| 20 BTU (BTU) | 21.101117 kJ (Kilojoule) |
| 50 BTU (BTU) | 52.752793 kJ (Kilojoule) |
| 100 BTU (BTU) | 105.505585 kJ (Kilojoule) |
| 500 BTU (BTU) | 527.527926 kJ (Kilojoule) |
| 1000 BTU (BTU) | 1055.06 kJ (Kilojoule) |
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FAQ
How much is 1 BTU in Kilojoule?
1 BTU = 1.055056 Kilojoule.
How do I convert BTU to Kilojoule?
Enter your value in BTU into the converter above and the result in Kilojoule appears instantly. 1 BTU equals 1.055056 kJ — just multiply your value by 1.055056.
What is the formula for BTU to Kilojoule?
The formula is: value in Kilojoule = value in BTU × 1.055056. For example, 5 BTU × 1.055056 = 5.275279 kJ.
Is this BTU to Kilojoule converter free and accurate?
Yes. This BTU to Kilojoule converter is 100% free, uses the exact international conversion factor (1.055056), and works on any device with no signup.
How do I convert Kilojoule back to BTU?
To convert back, divide by 1.055056 (or multiply by 0.947817). You can also use our dedicated How Many BTU 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.