BTU to Kilowatt-Hours Converter (BTU to kWh)
1 BTU = 0.000293071 kWh. Convert BTU totals from fuel and heating figures to kilowatt-hours to compare them with electricity, with both charts.
Kilowatt-Hour (kWh) = British Thermal Unit (BTU) × 0.000293071070172
British Thermal Unit (BTU): This converter uses the International Table British thermal unit, exactly 1,055.05585262 J. A BTU is an energy unit; a heating or cooling rate needs a time denominator such as BTU per hour.
Kilowatt-Hour (kWh): A kilowatt-hour (kWh) is 1,000 watt-hours, exactly 3.6 million joules. Electricity bills charge by the kWh, and electric-car battery sizes are quoted in kWh.
| British Thermal Unit (BTU) | Kilowatt-Hour (kWh) |
|---|---|
| 1 | 0.000293071070172 |
| 5 | 0.00146535535086 |
| 10 | 0.00293071070172 |
| 25 | 0.00732677675431 |
| 50 | 0.0146535535086 |
| 100 | 0.0293071070172 |
Propane, heating oil and natural gas are measured in British thermal units in the US, while electricity is billed in kilowatt-hours. Converting the fuel figures to kWh puts a gas furnace, an oil boiler and an electric heat pump on the same scale. The BTU used here is the International Table BTU, exactly 1,055.05585262 joules, and a kilowatt-hour is exactly 3.6 million joules.
The EIA's fuel figures are averages: a gallon of propane holds about 91,452 BTU and a cubic foot of natural gas about 1,036 BTU, and real deliveries vary a little. The conversion counts energy content, not useful heat; a furnace that is 95% efficient delivers 95% of the fuel's energy into the house.
How to use this tool
- Type a value in the British Thermal Unit box to see it in kilowatt-hours, or type in the Kilowatt-Hour box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Energy converter.
Formula
Kilowatt-Hour (kWh) = British Thermal Unit (BTU) × 0.000293071070172
British Thermal Unit (BTU) = Kilowatt-Hour (kWh) × 3412.14163313
Both factors come from exact definitions: 1 kilowatt-hour = 3412.14163313 British thermal units and 1 british thermal unit = 0.000293071070172 kilowatt-hours (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
100000 BTU × 0.000293071070172 ≈ 29.3071 kWh
30 kWh × 3412.14163313 ≈ 102364 BTU
British Thermal Unit to Kilowatt-Hour chart
Common values from British thermal units to kilowatt-hours, rounded to four decimal places.
| British Thermal Unit (BTU) | Kilowatt-Hour (kWh) |
|---|---|
| 1 | 0.0003 |
| 100 | 0.0293 |
| 1,000 | 0.2931 |
| 3,412 | 1 |
| 5,000 | 1.4654 |
| 10,000 | 2.9307 |
| 20,000 | 5.8614 |
| 25,000 | 7.3268 |
| 50,000 | 14.6536 |
| 75,000 | 21.9803 |
| 91,452 | 26.8019 |
| 100,000 | 29.3071 |
| 120,000 | 35.1685 |
| 138,500 | 40.5903 |
| 150,000 | 43.9607 |
| 250,000 | 73.2678 |
| 500,000 | 146.5355 |
| 1,000,000 | 293.0711 |
| 10,000,000 | 2,930.71 |
| 20,000,000 | 5,861.42 |
Kilowatt-Hour to British Thermal Unit chart
The reverse direction for values people often look up.
| Kilowatt-Hour (kWh) | British Thermal Unit (BTU) |
|---|---|
| 0.5 | 1,706.07 |
| 2 | 6,824.28 |
| 5 | 17,060.71 |
| 10 | 34,121.42 |
| 15 | 51,182.12 |
| 20 | 68,242.83 |
| 30 | 102,364.25 |
| 40 | 136,485.67 |
| 60 | 204,728.5 |
| 100 | 341,214.16 |
| 300 | 1,023,642.49 |
| 1,000 | 3,412,141.63 |
Energy amounts given in BTU
| Item | British Thermal Unit (BTU) | Kilowatt-Hour (kWh) |
|---|---|---|
| Warming 1 lb of water by 1 °F, roughly | 1 | 0.0003 |
| Heating 40 US gallons of water by 70 °F, about | 23,350 | 6.8432 |
| Gallon of propane, EIA average | 91,452 | 26.8019 |
| One therm of natural gas | 100,000 | 29.3071 |
| Gallon of motor gasoline, EIA average | 120,214 | 35.2312 |
| Cord of firewood, EIA average | 20,000,000 | 5,861.42 |
Quick mental estimate
Divide by 3,400, or drop two zeros and divide by 34: 100,000 BTU → 1,000 ÷ 34, roughly 29.4 kWh. Using 3,400 in place of 3,412.14 makes the answer about 0.4% high.
Use the converter or the charts when the exact figure matters.
The two units
British Thermal Unit (BTU): This converter uses the International Table British thermal unit, exactly 1,055.05585262 J. A BTU is an energy unit; a heating or cooling rate needs a time denominator such as BTU per hour.
Kilowatt-Hour (kWh): A kilowatt-hour (kWh) is 1,000 watt-hours, exactly 3.6 million joules. Electricity bills charge by the kWh, and electric-car battery sizes are quoted in kWh.
Frequently asked questions
How many kWh is 100,000 BTU?
About 29.31 kWh. Since 100,000 BTU is one therm, this pair is handy when comparing a gas bill in therms with an electric bill.
How do I compare a propane heater with an electric one?
Convert the fuel to kWh first: a gallon of propane carries about 26.8 kWh of energy. Then allow for efficiency, since a vented propane heater loses some heat up the flue while an electric resistance heater turns all the energy it draws into heat in the room.
Is BTU the same as BTU per hour?
No. A BTU is an amount of energy, like a kWh. Furnace and air-conditioner ratings are BTU per hour, a rate like the kilowatt, and convert on the BTU/h to watts converter.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/btu-to-kilowatt-hour-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). BTU to Kilowatt-Hours Converter (BTU to kWh). https://kakao.mobile/tools/btu-to-kilowatt-hour-converter/
“BTU to Kilowatt-Hours Converter (BTU to kWh).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/btu-to-kilowatt-hour-converter/.
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