Therms to Kilowatt-Hours Converter (thm to kWh)
1 therm = 29.3071 kWh (100,000 BTU). Convert natural gas therms from US utility bills to kilowatt-hours to compare gas with electricity.
Kilowatt-Hour (kWh) = Therm (thm) × 29.3071070172
Therm (thm): Here a therm means 100,000 International Table BTU, or 105.505585262 MJ. This differs from both the EC therm (105.506 MJ) and the US therm (105.4804 MJ); select the definition specified on your bill or data source.
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.
| Therm (thm) | Kilowatt-Hour (kWh) |
|---|---|
| 1 | 29.3071070172 |
| 5 | 146.535535086 |
| 10 | 293.071070172 |
| 25 | 732.677675431 |
| 50 | 1465.35535086 |
| 100 | 2930.71070172 |
US gas utilities bill by the therm, or turn the meter's cubic feet into therms using the heat content of the gas delivered that month. Electricity is billed in kilowatt-hours, so converting therms to kWh is the quickest way to compare a gas furnace or water heater with an electric or heat-pump option.
A therm here is 100,000 International Table BTU, which comes to 29.3071 kWh. The US therm (105.4804 MJ) and the EC therm (105.506 MJ) are defined slightly differently, no more than about 0.02% from this value. UK gas bills skip therms altogether and show kWh worked out from cubic meters, a volume correction factor and the gas's calorific value.
How to use this tool
- Type a value in the Therm 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) = Therm (thm) × 29.3071070172
Therm (thm) = Kilowatt-Hour (kWh) × 0.0341214163313
Both factors come from exact definitions: 1 kilowatt-hour = 0.0341214163313 therms and 1 therm = 29.3071070172 kilowatt-hours (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
50 thm × 29.3071070172 ≈ 1465.36 kWh
1000 kWh × 0.0341214163313 ≈ 34.1214 thm
Therm to Kilowatt-Hour chart
Common values from therms to kilowatt-hours, rounded to four decimal places.
| Therm (thm) | Kilowatt-Hour (kWh) |
|---|---|
| 0.1 | 2.9307 |
| 0.25 | 7.3268 |
| 0.4 | 11.7228 |
| 0.5 | 14.6536 |
| 1 | 29.3071 |
| 1.5 | 43.9607 |
| 2 | 58.6142 |
| 3 | 87.9213 |
| 5 | 146.5355 |
| 8 | 234.4569 |
| 10 | 293.0711 |
| 15 | 439.6066 |
| 20 | 586.1421 |
| 25 | 732.6777 |
| 30 | 879.2132 |
| 40 | 1,172.28 |
| 50 | 1,465.36 |
| 60 | 1,758.43 |
| 75 | 2,198.03 |
| 100 | 2,930.71 |
| 125 | 3,663.39 |
| 150 | 4,396.07 |
| 200 | 5,861.42 |
| 500 | 14,653.55 |
| 1,000 | 29,307.11 |
Kilowatt-Hour to Therm chart
The reverse direction for values people often look up.
| Kilowatt-Hour (kWh) | Therm (thm) |
|---|---|
| 10 | 0.3412 |
| 29.3 | 0.9998 |
| 50 | 1.7061 |
| 100 | 3.4121 |
| 250 | 8.5304 |
| 500 | 17.0607 |
| 750 | 25.5911 |
| 1,000 | 34.1214 |
| 1,500 | 51.1821 |
| 2,000 | 68.2428 |
| 3,000 | 102.3642 |
| 5,000 | 170.6071 |
Gas quantities in therms
| Item | Therm (thm) | Kilowatt-Hour (kWh) |
|---|---|---|
| Water heater with a 40,000 BTU/h burner, one hour | 0.4 | 11.7228 |
| Gallon of propane, about | 0.915 | 26.816 |
| Furnace with a 100,000 BTU/h input, one hour | 1 | 29.3071 |
| 100 cubic feet of natural gas (Ccf), about | 1.036 | 30.3622 |
| Dekatherm, equal to one million BTU | 10 | 293.0711 |
| 1,000 cubic feet of natural gas (Mcf), about | 10.36 | 303.6216 |
Quick mental estimate
Multiply by 30, then take away 2%: 50 therms → 1,500 − 30 = 1,470 kWh. The shortcut uses 29.4 kWh per therm, about 0.3% high.
Use the converter or the charts when the exact figure matters.
The two units
Therm (thm): Here a therm means 100,000 International Table BTU, or 105.505585262 MJ. This differs from both the EC therm (105.506 MJ) and the US therm (105.4804 MJ); select the definition specified on your bill or data source.
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 one therm?
One therm is about 29.31 kWh, because it is 100,000 BTU and each kWh is about 3,412 BTU. A household that burns 60 therms in a winter month has used about 1,758 kWh of gas energy.
How do I convert my gas meter reading to therms?
Utilities multiply the hundreds of cubic feet (Ccf) used by a therm factor printed on the bill, often a little above 1 because US natural gas averages about 1,036 BTU per cubic foot. Multiplying the resulting therms by 29.31 then gives kWh.
Is a therm the same as a dekatherm?
No. A dekatherm is ten therms, or one million BTU (MMBtu), the unit many gas contracts and wholesale prices use. Ten therms come to about 293 kWh.
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/therm-to-kilowatt-hour-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Therms to Kilowatt-Hours Converter (thm to kWh). https://kakao.mobile/tools/therm-to-kilowatt-hour-converter/
“Therms to Kilowatt-Hours Converter (thm to kWh).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/therm-to-kilowatt-hour-converter/.
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