Convert British thermal units to Kilowatt-hours
1 British thermal unit is 0.000293 kWh. One British thermal unit is exactly 0.000293071070172 kilowatt-hours.
One British thermal unit is 2.9307 × 10^-4 kilowatt-hours. To convert British thermal units to kilowatt-hours, multiply by 2.9307 × 10^-4; to go the other way, divide by 2.9307 × 10^-4 or multiply by 3412.1416. The factor is exact rather than rounded: it follows from NIST Special Publication 811. The international-table BTU, fixed at exactly 1055.05585262 joules.
Factor checked against the defining standard · How we check
- British thermal units × 2.9307 × 10^-4
value * 0.0002930710701720 kWh
1 British thermal unit in every energy unit
| Unit | Value | Exact factor |
|---|---|---|
| joules | 1,055.055853 J | × 1,055.05585262 |
| kilojoules | 1.055055853 kJ | × 1.05505585262 |
| calories | 252.1644007 cal | × 252.164400722 |
| kilocalories | 0.2521644007 kcal | × 0.252164400722 |
| watt-hours | 0.2930710702 Wh | × 0.293071070172 |
| kilowatt-hours | 0.0002930710702 kWh | × 0.000293071070172 |
| British thermal units (as entered) | 1 BTU | — |
| foot-pounds | 778.1692623 ft·lbf | × 778.169262266 |
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 British thermal units to kilowatt-hours?
- 1.Take the measurement in British thermal units.
- 2.Multiply by 2.9307 × 10^-4 — that is how many kilowatt-hours fit in one British thermal unit.
- 3.To go back the other way, divide by 2.9307 × 10^-4, or multiply by 3412.1416.
Worked example: 25 British thermal units to kilowatt-hours
- Formula
- BTU × 2.9307 × 10^-4 = kWh
- Arithmetic
- 25 × 2.9307 × 10^-4 = 0.007327 kWh
- Answer
- 25 BTU = 0.007327 kWh
The factor is rounded for display; the figure above is computed from the full value.
British thermal units to kilowatt-hours conversion table
| British thermal units | Kilowatt-hours |
|---|---|
| 1 BTU | 0.000293 kWh |
| 2 BTU | 0.000586 kWh |
| 3 BTU | 0.000879 kWh |
| 4 BTU | 0.001172 kWh |
| 5 BTU | 0.001465 kWh |
| 6 BTU | 0.001758 kWh |
| 7 BTU | 0.002051 kWh |
| 8 BTU | 0.002345 kWh |
| 9 BTU | 0.002638 kWh |
| 10 BTU | 0.002931 kWh |
| 12 BTU | 0.003517 kWh |
| 15 BTU | 0.004396 kWh |
| 20 BTU | 0.005861 kWh |
| 25 BTU | 0.007327 kWh |
| 50 BTU | 0.014654 kWh |
| 100 BTU | 0.029307 kWh |
| 200 BTU | 0.058614 kWh |
| 300 BTU | 0.087921 kWh |
| 500 BTU | 0.146536 kWh |
| 1000 BTU | 0.293071 kWh |
| 2000 BTU | 0.586142 kWh |
| 5000 BTU | 1.465355 kWh |
| 10000 BTU | 2.930711 kWh |
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.
What is a kilowatt-hour?
A thousand watt-hours, and the unit every electricity bill is added up in. Exactly 3.6 megajoules, and the reason a 100 W bulb left on for ten hours costs one unit.
How many kilowatt-hours are in a British thermal unit?
One British thermal unit is 2.9307 × 10^-4 kilowatt-hours. Going the other way, one kilowatt-hour is 3412.1416 British thermal units. 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 kilowatt-hours are in a British thermal unit?
- 2.9307 × 10^-4. A thousand watt-hours, and the unit every electricity bill is added up in. Exactly 3.6 megajoules, and the reason a 100 W bulb left on for ten hours costs one unit.
- How do I convert kilowatt-hours back to British thermal units?
- Divide by 2.9307 × 10^-4, or multiply by 3412.1416 — they are the same operation.
Other energy conversions
Kilowatt-hours to British thermal units — the same conversion the other way.