Watt-seconds to Therms Conversion

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

Results in Therms:
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1 Ws = 9.4782E-9 therms
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Watt-seconds to Therms

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

Since one watt-second is equal to 9.4782E-9 therms, you can use this simple formula to convert:

therms = watt-seconds × 9.4782E-9

The energy in therms is equal to the watt-seconds multiplied by 9.4782E-9.

For example, here's how to convert 500,000,000 watt-seconds to therms using the formula above.
500,000,000 Ws = (500,000,000 × 9.4782E-9) = 4.739086 therms

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


The watt-second is a measure of electrical energy equal to one watt of power over a one second period. One watt-second is equal to 1/3,600 of a watt-hour or one joule.

Watt-seconds are usually abbreviated as Ws, although the formally adopted expression is W·s. The abbreviation W s is also sometimes used. For example, 1 watt-second can be written as 1 Ws, 1 W·s, or 1 W s.

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-second to Therm Conversion Table

Watt-second measurements converted to therms
Watt-seconds Therms
1 Ws 0.0000000094782
2 Ws 0.000000018956
3 Ws 0.000000028435
4 Ws 0.000000037913
5 Ws 0.000000047391
6 Ws 0.000000056869
7 Ws 0.000000066347
8 Ws 0.000000075825
9 Ws 0.000000085304
10 Ws 0.000000094782
100 Ws 0.00000094782
1,000 Ws 0.0000094782
10,000 Ws 0.000094782
100,000 Ws 0.000948
1,000,000 Ws 0.009478
10,000,000 Ws 0.094782
100,000,000 Ws 0.947817
1,000,000,000 Ws 9.4782


  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

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