Therm to BTU (th) Converter

Energy Converter

27 units available

Decimals:

From

To

100,066.946708

1 thm = 100,066.946708 BTU

Formula:

BTU = thm × 100,066.9467083985

With your value: 1 thm = 100,066.9467084 BTU

How big is that?

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

Heartbeat (1/1.1e+8 your value)9.48e-9 thm

AA battery charge (1/1.1e+4 your value)0.0000948 thm

Slice of bread (1/3.8e+2 your value)0.00265 thm

Daily food intake (1/13 your value)0.0796 thm

Litre of petrol (1/3.1 your value)0.324 thm

Your value1.00 thm

Other Therm to BTU (th) conversions

2 thm to BTU 3 thm to BTU 4 thm to BTU 5 thm to BTU 6 thm to BTU 7 thm to BTU 8 thm to BTU

Therm to BTU (th) Conversion Table

Therm (thm)	BTU (th) (BTU)
0.5	50,033.473354
1	100,066.946708
2	200,133.893417
5	500,334.733542
10	1,000,669.467084
15	1,501,004.200626
20	2,001,338.934168
25	2,501,673.66771
50	5,003,347.33542
100	10,006,694.67084
250	25,016,736.6771
500	50,033,473.354199
1000	100,066,946.708399

BTU (th) to Therm Conversion Table

BTU (th) (BTU)	Therm (thm)
0.5	4.996655e-6
1	9.993310e-6
2	1.998662e-5
5	4.996655e-5
10	9.993310e-5
15	0.00015
20	0.0002
25	0.00025
50	0.0005
100	0.000999
250	0.002498
500	0.004997
1000	0.009993

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.

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

BTU (th) (BTU)

Energy

Exact conversion

The International Table BTU is exactly 1055.055 852 62 J.

Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.

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 Therm to BTU (th)

To convert from Therm (thm) to BTU (th) (BTU), multiply the value by 100,066.9467083985.

Formula: BTU = thm × 100,066.9467083985

Reverse: thm = BTU × 0.0000099933

Step-by-Step Example

Start with your value in Therm. For example: 5 thm
Multiply by the conversion factor: 5 x 100,066.9467083985
The result is: 500,334.733542 BTU

About Therm

The therm (thm) is a unit of energy and work. One therm equals 1.055056 × 10^+8 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

About BTU (th)

The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

Frequently Asked Questions

How many BTU (th) are in 1 Therm?

There are exactly 100,066.9467083985 BTU (th) in 1 Therm. This means the conversion factor from Therm to BTU (th) is 100,066.9467083985.

What is the formula to convert Therm to BTU (th)?

The formula to convert Therm to BTU (th) is: BTU = thm × 100,066.9467083985. For example, to convert 10 Therm to BTU (th), you would multiply 10 by 100,066.9467083985.

What is a Therm?