BTU to Kilojoules converter (BTU to kJ)
Convert BTU (BTU) to Kilojoules (kJ) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert BTU to Kilojoules
1 BTU (British Thermal Unit) is equal to 1.05506 kilojoules (kJ).
E(kJ) = E(BTU) × 1.05506
Multiply BTU by 1.05506:
Example: Convert 100 BTU to kJ:
E(kJ) = 100 × 1.05506 = 105.506 kJ
What is a BTU?
The BTU (BTU) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Kilojoules?
The Kilojoules (kJ) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts energy from BTU into Kilojoules. One BTU equals 1.05505585 kJ.
BTU to Kilojoules conversion table
Common BTU values and the matching kJ result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| BTU (BTU) | Kilojoules (kJ) |
|---|---|
| 0 BTU | 0 kJ |
| 1 BTU | 1.05505585 kJ |
| 5 BTU | 5.27527925 kJ |
| 10 BTU | 10.5505585 kJ |
| 100 BTU | 105.505585 kJ |
| 500 BTU | 527.527925 kJ |
| 1000 BTU | 1055.05585 kJ |
How this calculator works
The form on this page is a BTU-to-Kilojoules converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the kJ result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many kJ are in 1 BTU?
1 BTU = 1.05505585 kJ.
How do I convert BTU to Kilojoules?
Multiply BTU by 1.05506:
Is this BTU to kJ converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.