Watt-hours to Therms Conversion

Enter the energy in watt-hours below to get the value converted to therms.

Results in Therms:
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1 Wh = 3.4121E-5 therms
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Watt-hours to Therms

To convert a watt-hour measurement to a therm measurement, multiply the energy by the conversion ratio.

Since one watt-hour is equal to 3.4121E-5 therms, you can use this simple formula to convert:

therms = watt-hours × 3.4121E-5

The energy in therms is equal to the watt-hours multiplied by 3.4121E-5.

For example, here's how to convert 50,000 watt-hours to therms using the formula above.
50,000 Wh = (50,000 × 3.4121E-5) = 1.706071 therms

Watt-hours and therms are both units used to measure energy. Keep reading to learn more about each unit of measure.


The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.[1]


One therm is a measure of heat energy equal to 100,000 BTU, which are equal to the amount of heat energy required to increase the temperature of one pound of water one degree Fahrenheit. Therms are often used by natural gas companies to measure the heat equivalent of gas used.

The therm is a US customary unit of energy.

Watt-hour to Therm Conversion Table

Watt-hour measurements converted to therms
Watt-hours Therms
1 Wh 0.000034121
2 Wh 0.000068243
3 Wh 0.000102
4 Wh 0.000136
5 Wh 0.000171
6 Wh 0.000205
7 Wh 0.000239
8 Wh 0.000273
9 Wh 0.000307
10 Wh 0.000341
100 Wh 0.003412
1,000 Wh 0.034121
10,000 Wh 0.341214
100,000 Wh 3.4121


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf