Skip to main content
    UnitConvertLab
    UnitConvertLAB
    Energy Conversion

    Watt-Hour to Therm Converter

    Quick answer

    To convert Watt-Hours to Therms, multiply by 3.412142e-5 (or divide by 29,307.1070172222). Therefore, 1 Watt-Hour (Wh) equals 3.412142e-5 Therms (thm).

    Formula: thm = Wh × 3.412142e-5. Worked example: 10 Wh = 0.000341 thm.

    Convert Watt-Hour (Wh) to Therm (thm) online with our free unit converter. In energy, 1 Wh = 3.412142e-5 thm. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.

    Worked example: converting Watt-Hour to Therm

    1. Step 1 — start with the formula. thm = Wh × 0.0000341214
    2. Step 2 — substitute your figure. 10 Wh × 3.412142e-5
    3. Step 3 — read the result. 10 Wh = 0.000341 thm
    4. Step 4 — check it in reverse. Wh = thm × 29,307.1070172222 returns 9.9937 Wh, which matches the figure you started with.

    Energy Converter

    27 units available

    Decimals:
    3.412142e-5

    1 Wh = 3.412142e-5 thm

    Formula:

    thm = Wh × 0.0000341214

    With your value: 1 Wh = 3.412142e-5 thm

    How big is that?

    Everyday references on a logarithmic scale, all expressed in watt-hour so you can sanity-check the result.

    Heartbeat (1/3.6e+3 your value)0.000278 Wh
    Your value1.00 Wh
    AA battery charge (2.8× your value)2.78 Wh
    Slice of bread (78× your value)77.8 Wh
    Daily food intake (2.3e+3× your value)2.33e+3 Wh
    Litre of petrol (9.5e+3× your value)9.50e+3 Wh

    Other Watt-Hour to Therm conversions

    2 Wh to thm3 Wh to thm4 Wh to thm5 Wh to thm6 Wh to thm7 Wh to thm8 Wh to thm

    Watt-Hour to Therm Conversion Table

    Watt-Hour (Wh)Therm (thm)
    0.51.706071e-5
    13.412142e-5
    26.824283e-5
    50.000171
    100.000341
    150.000512
    200.000682
    250.000853
    500.001706
    1000.003412
    2500.00853
    5000.017061
    10000.034121

    Therm to Watt-Hour Conversion Table

    Therm (thm)Watt-Hour (Wh)
    0.514,653.553509
    129,307.107017
    258,614.214034
    5146,535.535086
    10293,071.070172
    15439,606.605258
    20586,142.140344
    25732,677.675431
    501,465,355.350861
    1002,930,710.701722
    2507,326,776.754306
    50014,653,553.508611
    100029,307,107.017222

    Where these values come from

    Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

    Watt-Hour (Wh)

    Energy

    Exact conversion

    Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

    Source: NIST Special Publication 811, Guide for the Use of the International System of Units

    National Institute of Standards and Technology (US) · Reviewed 2026-07-01

    Therm (thm)

    Energy

    Exact conversion

    Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

    Source: NIST Special Publication 811, Guide for the Use of the International System of Units

    National Institute of Standards and Technology (US) · Reviewed 2026-07-01

    How to Convert Watt-Hour to Therm

    To convert from Watt-Hour (Wh) to Therm (thm), multiply the value by 3.412142e-5.

    Formula: thm = Wh × 0.0000341214

    Reverse: Wh = thm × 29,307.1070172222

    Step-by-Step Example

    1. Start with your value in Watt-Hour. For example: 5 Wh
    2. Multiply by the conversion factor: 5 x 3.412142e-5
    3. The result is: 0.000171 thm

    Watt-Hour and Therm Relationship

    This calculation facilitates standardized conversion between recognized units of energy. Since 1 Watt-Hour represents a fraction of a Therm (1 Therm ≈ 2.931e+4 Watt-Hours), the Therm is the larger measurement interval. Understanding the relationship between Watt-Hour and Therm is essential for accurate calculations in physics, engineering, commerce, and daily applications.

    About Watt-Hour

    The Watt-Hour (symbol: Wh) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.

    Common uses of Watt-Hour: energy calculations, engineering and science, education.

    About Therm

    The Therm (symbol: thm) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.

    Common uses of Therm: energy calculations, engineering and science, education.

    Frequently Asked Questions

    How many Therms are in 1 Watt-Hour?
    There are exactly 3.412142e-5 Therms in 1 Watt-Hour. This means the conversion factor from Watt-Hour to Therm is 3.412142e-5.
    What is the formula to convert Watt-Hour to Therm?
    The formula to convert Watt-Hour to Therm is: thm = Wh × 0.0000341214. For example, to convert 10 Watt-Hours to Therms, you would multiply 10 by 3.412142e-5.
    What is a Watt-Hour?
    The Watt-Hour (symbol: Wh) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.
    What is a Therm?
    The Therm (symbol: thm) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
    What are the common uses of Watt-Hour?
    The Watt-Hour is commonly used in energy calculations, engineering and science, education.

    Related Energy Conversions

    Joule → ThermKilojoule → ThermMegajoule → ThermGigajoule → ThermMillijoule → ThermCalorie (th) → ThermCalorie (IT) → ThermKilocalorie → ThermBTU (th) → Therm

    Cite this page

    UnitConvertLab. (2026). Watt-Hour to Therm converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/watt_hour-to-therm