The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage.
Therms to Watt hours
Convert US therm (therm) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert therms (therm) to watt hours (Wh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Wh = therm × 29300.11111
Results update instantly for Therms to Watt hours conversions.
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Formula
Wh = therm × 29300.11111
therm = Wh × 0.00003412956341
Conversion table
| 1 therm | 29300.111111 Wh |
| 5 therm | 146500.555556 Wh |
| 10 therm | 293001.111111 Wh |
| 20 therm | 586002.222222 Wh |
| 50 therm | 1.465006e+06 Wh |
| 100 therm | 2.930011e+06 Wh |
| 500 therm | 1.465006e+07 Wh |
| 1000 therm | 2.930011e+07 Wh |
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How the formula works
Both us therm and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in therms by 29300.11111 to get watt hours. To reverse the conversion, multiply a watt-hour value by 0.00003412956341 to get back to therms.
Frequently asked questions
What is US therm (therm)?
The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage.
What is Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
How do I convert therms to watt hours?
Multiply the us therm value by 29300.11111 to get the equivalent in watt hours. For example, 5 therm × 29300.11111 = 146500.555556 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 29300.11111 is an exact, non-rounded value.
Can I convert watt hours back to therms?
Yes. Divide the watt-hour value by 29300.11111, or multiply it by 0.00003412956341, to get therms.
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About converting therms to watt hours
The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage. A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Use this calculator to move between therms and watt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.