Kilojoules to British thermal units
Type a value in kilojoules to see it in British thermal units straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the kilojoules box.
- Read the result in British thermal units as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
BTU = kJ × 0.9478171203
Multiply the value in kilojoules by 0.9478171203 to get British thermal units.
Example
To convert 25 kJ to British thermal units: 25 × 0.9478171203 = 23.6954 BTU.
Conversion table
| Kilojoules (kJ) | British thermal units (BTU) |
|---|---|
| 1 | 0.947817 |
| 2 | 1.89563 |
| 3 | 2.84345 |
| 5 | 4.73909 |
| 10 | 9.47817 |
| 20 | 18.9563 |
| 25 | 23.6954 |
| 50 | 47.3909 |
| 100 | 94.7817 |
| 250 | 236.954 |
| 500 | 473.909 |
| 1,000 | 947.817 |
About the units
- Kilojoule
- Exactly 1000 joules. It appears on food labels next to the calorie figure.
- British thermal unit
- The imperial unit of heat, using the International Table definition of exactly 1055.05585262 joules. Seen in air conditioner and heater ratings.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many British thermal units are in one kilojoule?
1 kJ = 0.947817 BTU exactly.
How do I convert kilojoules to British thermal units?
Use BTU = kJ × 0.9478171203. For example, 25 kJ = 23.6954 BTU.
How many kilojoules are in one British thermal unit?
1 BTU = 1.05506 kJ.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.