One kWh is 3,412.14 BTU, and one therm of natural gas (100,000 BTU) is 29.31 kWh.
| Kilowatt-hours (kWh) | BTU |
|---|---|
| 1 | 3,412 |
| 2 | 6,824 |
| 3 | 10,236 |
| 4 | 13,649 |
| 5 | 17,061 |
| 6 | 20,473 |
| 7 | 23,885 |
| 8 | 27,297 |
| 9 | 30,709 |
| 10 | 34,121 |
| 11 | 37,534 |
| 12 | 40,946 |
| 13 | 44,358 |
| 14 | 47,770 |
| 15 | 51,182 |
| 16 | 54,594 |
| 17 | 58,006 |
| 18 | 61,419 |
| 19 | 64,831 |
| 20 | 68,243 |
| 21 | 71,655 |
| 22 | 75,067 |
| 23 | 78,479 |
| 24 | 81,891 |
| 25 | 85,304 |
| 26 | 88,716 |
| 27 | 92,128 |
| 28 | 95,540 |
| 29 | 98,952 |
| 30 | 102,364 |
| 31 | 105,776 |
| 32 | 109,189 |
| 33 | 112,601 |
| 34 | 116,013 |
| 35 | 119,425 |
| 36 | 122,837 |
| 37 | 126,249 |
| 38 | 129,661 |
| 39 | 133,074 |
| 40 | 136,486 |
How it is computed
BTU = kWh × 3,600,000 ÷ 1,055.05585262. A kilowatt-hour is 3.6 million joules, and the International Table BTU is 1,055.05585262 J.
FAQ
Is BTU the same as BTU per hour?+
No. BTU is energy, like kWh; BTU/h is power, like kW. An air conditioner rated 12,000 BTU/h draws heat at about 3.5 kW.
How do I compare gas and electric heating costs?+
Convert both to the same energy unit, then divide the price by the energy delivered after appliance efficiency.