Therms to kWh Converter
Updated Formulas shown
One US therm is about 29.3 kWh (100,000 BTU). A month with 80 therms of gas heat is 2,344 kWh of heat energy.
Formula: kilowatt-hours = therms × 29.3001111111
Common values: therms → kilowatt-hours
| therms | kilowatt-hours |
|---|---|
| 29.3001 kWh | |
| 58.6002 kWh | |
| 87.9003 kWh | |
| 146.501 kWh | |
| 293.001 kWh | |
| 586.002 kWh | |
| 732.503 kWh | |
| 1,465.01 kWh | |
| 2,930.01 kWh | |
| 7,325.03 kWh | |
| 14,650.1 kWh | |
| 29,300.1 kWh |
1 thm in every energy unit
- 105,480,000 J
- 105,480 kJ
- 105.48 MJ
- 25,210,400 cal
- 25,210.4 kcal
- 29,300.1 Wh
- 29.3001 kWh
- 99,976.1 BTU
- 77,798,400 ft·lbf
How to convert therms to kilowatt-hours
- Type the value in therms into the converter (or into the right-hand box to go the other way).
- Multiply by 29.3001111111 to get kilowatt-hours.
- Round to a sensible precision with the Decimals control; the table below covers the values people look up most.
Therm (US) to kilowatt-hour formula
kilowatt-hours = therms × 29.3001111111 — 1 thm = 29.30011111 kWh. This factor is a conventional value from NIST SP 811, accurate to well beyond any practical measurement.
thm to kWh conversion table
| therms | kWh | BTU |
|---|---|---|
| 1 | 29.3 | 99,976 |
| 5 | 146.5 | 499,881 |
| 10 | 293 | 999,761 |
| 20 | 586 | 1,999,523 |
| 25 | 732.5 | 2,499,403 |
| 30 | 879 | 2,999,284 |
| 40 | 1,172 | 3,999,045 |
| 50 | 1,465 | 4,998,806 |
| 60 | 1,758 | 5,998,568 |
| 75 | 2,197.5 | 7,498,210 |
| 80 | 2,344 | 7,998,090 |
| 100 | 2,930 | 9,997,613 |
| 150 | 4,395 | 14,996,419 |
| 200 | 5,860 | 19,995,226 |
| 300 | 8,790 | 29,992,839 |
| 500 | 14,650.1 | 49,988,064 |
| 1,000 | 29,300.1 | 99,976,129 |
From gas bill to heat-pump bill
Multiply therms by the furnace efficiency to get heat delivered, then divide by the heat pump's seasonal COP. 80 therms in a 95% furnace is about 2,230 kWh of heat; a heat pump with COP 3 needs about 740 kWh of electricity to deliver the same. Gas meters that read in hundreds of cubic feet (CCF) are close to 1 therm per CCF — your bill lists the exact conversion factor.
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Frequently asked questions
How many kWh in a therm?
29.3 kWh. NIST defines the US therm as 105,480,400 J.
Is a therm exactly 100,000 BTU?
Yes, but using the 59 °F BTU. In International Table BTU it's 99,976 BTU — a 0.02% difference.
How many therms is 1,000 kWh?
34.1 therms.
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Estimates only. Check quantities with your supplier or contractor before ordering.