BTU (th) to Therm Converter

Energy Converter

27 units available

Decimals:

From

To

9.993310e-6

1 BTU = 9.993310e-6 thm

Formula:

thm = BTU × 0.0000099933

With your value: 1 BTU = 9.993310e-6 thm

How big is that?

Everyday references on a logarithmic scale, all expressed in btu (th) so you can sanity-check the result.

Heartbeat (1/1.1e+3 your value)0.000948 BTU

Your value1.00 BTU

AA battery charge (9.5× your value)9.48 BTU

Slice of bread (2.7e+2× your value)266 BTU

Daily food intake (8.0e+3× your value)7.97e+3 BTU

Litre of petrol (3.2e+4× your value)3.24e+4 BTU

Other BTU (th) to Therm conversions

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

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

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

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.

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

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 BTU (th) to Therm

To convert from BTU (th) (BTU) to Therm (thm), multiply the value by 9.993310e-6.

Formula: thm = BTU × 0.0000099933

Reverse: BTU = thm × 100,066.9467083985

Step-by-Step Example

Start with your value in BTU (th). For example: 5 BTU
Multiply by the conversion factor: 5 x 9.993310e-6
The result is: 4.996655e-5 thm

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.

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.

Frequently Asked Questions

How many Therm are in 1 BTU (th)?

There are exactly 9.993310e-6 Therm in 1 BTU (th). This means the conversion factor from BTU (th) to Therm is 9.993310e-6.

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

The formula to convert BTU (th) to Therm is: thm = BTU × 0.0000099933. For example, to convert 10 BTU (th) to Therm, you would multiply 10 by 9.993310e-6.

What is a BTU (th)?