Convert Kilojoules to British thermal units
1 kilojoule is 0.947817 BTU. One kilojoule is exactly 0.947817120313 British thermal units.
One kilojoule is 0.94781712 British thermal units. To convert kilojoules to British thermal units, multiply by 0.94781712; to go the other way, divide by 0.94781712 or multiply by 1.0550559. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A thousand joules.
Factor checked against the defining standard · How we check
- Kilojoules × 0.94781712
value * 0.9478171203130.948 BTU
1 kilojoule in every energy unit
| Unit | Value | Exact factor |
|---|---|---|
| joules | 1,000 J | × 1,000 |
| kilojoules (as entered) | 1 kJ | — |
| calories | 239.0057361 cal | × 239.005736138 |
| kilocalories | 0.2390057361 kcal | × 0.239005736138 |
| watt-hours | 0.2777777778 Wh | × 0.277777777778 |
| kilowatt-hours | 0.0002777777778 kWh | × 0.000277777777778 |
| British thermal units | 0.9478171203 BTU | × 0.947817120313 |
| foot-pounds | 737.5621493 ft·lbf | × 737.562149277 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert kilojoules to British thermal units?
- 1.Take the measurement in kilojoules.
- 2.Multiply by 0.94781712 — that is how many British thermal units fit in one kilojoule.
- 3.To go back the other way, divide by 0.94781712, or multiply by 1.0550559.
Worked example: 25 kilojoules to British thermal units
- Formula
- kJ × 0.94781712 = BTU
- Arithmetic
- 25 × 0.94781712 = 23.695428 BTU
- Answer
- 25 kJ = 23.695428 BTU
The factor is rounded for display; the figure above is computed from the full value.
Kilojoules to British thermal units conversion table
| Kilojoules | British thermal units |
|---|---|
| 1 kJ | 0.947817 BTU |
| 2 kJ | 1.895634 BTU |
| 3 kJ | 2.843451 BTU |
| 4 kJ | 3.791268 BTU |
| 5 kJ | 4.739086 BTU |
| 6 kJ | 5.686903 BTU |
| 7 kJ | 6.63472 BTU |
| 8 kJ | 7.582537 BTU |
| 9 kJ | 8.530354 BTU |
| 10 kJ | 9.478171 BTU |
| 12 kJ | 11.373805 BTU |
| 15 kJ | 14.217257 BTU |
| 20 kJ | 18.956342 BTU |
| 25 kJ | 23.695428 BTU |
| 50 kJ | 47.390856 BTU |
| 100 kJ | 94.781712 BTU |
| 200 kJ | 189.563424 BTU |
| 300 kJ | 284.345136 BTU |
| 500 kJ | 473.90856 BTU |
| 1000 kJ | 947.81712 BTU |
| 2000 kJ | 1,895.634241 BTU |
| 5000 kJ | 4,739.085602 BTU |
| 10000 kJ | 9,478.171203 BTU |
What is a kilojoule?
A thousand joules. Food energy outside the US is labelled here, alongside or instead of calories.
What is a British thermal unit?
The international-table BTU, fixed at exactly 1055.05585262 joules. Roughly the heat needed to raise a pound of water by one degree Fahrenheit, which is where it came from.
How many British thermal units are in a kilojoule?
One kilojoule is 0.94781712 British thermal units. Going the other way, one British thermal unit is 1.0550559 kilojoules. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every energy unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Joules | J | the base unit |
| Kilojoules | kJ | 1000 joule |
| Calories | cal | 4.184 joule |
| Kilocalories | kcal | 4184 joule |
| Watt-hours | Wh | 3600 joule |
| Kilowatt-hours | kWh | 3600000 joule |
| British thermal units | BTU | 1055.0559 joule |
| Foot-pounds | ft·lbf | 1.3558179 joule |
Source: NIST Special Publication 811 — the thermochemical calorie is exactly 4.184 J
Questions people actually ask
- How many British thermal units are in a kilojoule?
- 0.94781712. The international-table BTU, fixed at exactly 1055.05585262 joules. Roughly the heat needed to raise a pound of water by one degree Fahrenheit, which is where it came from.
- How do I convert British thermal units back to kilojoules?
- Divide by 0.94781712, or multiply by 1.0550559 — they are the same operation.
Other energy conversions
British thermal units to kilojoules — the same conversion the other way.