How to convert joules to British thermal units
To convert joules (J) to British thermal units (BTU), multiply the value in joules by 0.000947817120313.
BTU = J × 0.000947817120313
Example: 10 J = 0.009478171203 BTU.
You can also type 10 J to BTU into the smart calculator, or mix units: 1 J + 1 BTU.
Joules to British Thermal Units conversion table
| Joules | British Thermal Units |
|---|---|
| 0.01 J | 0.0000094781712 BTU |
| 0.1 J | 0.000094781712 BTU |
| 0.25 J | 0.00023695428 BTU |
| 0.5 J | 0.00047390856 BTU |
| 1 J | 0.00094781712 BTU |
| 2 J | 0.0018956342 BTU |
| 3 J | 0.0028434514 BTU |
| 4 J | 0.0037912685 BTU |
| 5 J | 0.0047390856 BTU |
| 6 J | 0.0056869027 BTU |
| 7 J | 0.0066347198 BTU |
| 8 J | 0.007582537 BTU |
| 9 J | 0.0085303541 BTU |
| 10 J | 0.0094781712 BTU |
| 12 J | 0.011373805 BTU |
| 15 J | 0.014217257 BTU |
| 20 J | 0.018956342 BTU |
| 25 J | 0.023695428 BTU |
| 30 J | 0.028434514 BTU |
| 40 J | 0.037912685 BTU |
| 50 J | 0.047390856 BTU |
| 60 J | 0.056869027 BTU |
| 75 J | 0.071086284 BTU |
| 100 J | 0.094781712 BTU |
| 250 J | 0.23695428 BTU |
| 500 J | 0.47390856 BTU |
| 1,000 J | 0.94781712 BTU |
Converting British thermal units back to joules
1 BTU = 1,055.055853 J. See the British Thermal Units to Joules converter, or press the swap button above.
About the units
Joule (J)
The SI unit of energy: one newton acting over one meter.
British thermal unit (BTU)
About 1,055 joules (International Table value), used for heating and cooling.
Energy is the capacity to do work. The SI unit is the joule. Food energy is labelled in kilocalories (Calories with a capital C) or kilojoules, electricity is billed in kilowatt-hours, and heating often uses BTU or therms.
Questions and answers
How many British thermal units are in a joule?
One joule (J) equals 0.0009478171203 British thermal units (BTU).
How do I convert joules to British thermal units?
To convert joules to British thermal units, multiply the value in joules by 0.000947817120313. The formula is BTU = J × 0.000947817120313. For example, 10 J = 0.0094781712 BTU.
What is 10 J in BTU?
10 joules is 0.009478171203 British thermal units.
Which is bigger, a joule or a British thermal unit?
A British thermal unit is bigger: 1 BTU = 1,055.055853 J.
Are Calories on food labels the same as calories?
No. The food Calorie (capital C) is a kilocalorie: 1,000 small calories, or 4.184 kilojoules.
Does this J to BTU converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.