Therm to Calorie (th) Converter

Energy Converter

27 units available

Decimals:

From

To

25,216,440.07218

1 thm = 25,216,440.07218 cal

Formula:

cal = thm × 25,216,440.07217973

With your value: 1 thm = 25,216,440.07217973 cal

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 Calorie (th) conversions

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

Therm to Calorie (th) Conversion Table

Therm (thm)	Calorie (th) (cal)
0.5	12,608,220.03609
1	25,216,440.07218
2	50,432,880.144359
5	126,082,200.360899
10	252,164,400.721797
15	378,246,601.082696
20	504,328,801.443595
25	630,411,001.804493
50	1,260,822,003.608987
100	2,521,644,007.217973
250	6,304,110,018.044932
500	12,608,220,036.089865
1000	25,216,440,072.17973

Calorie (th) to Therm Conversion Table

Calorie (th) (cal)	Therm (thm)
0.5	1.982833e-8
1	3.965667e-8
2	7.931334e-8
5	1.982833e-7
10	3.965667e-7
15	5.948500e-7
20	7.931334e-7
25	9.914167e-7
50	1.982833e-6
100	3.965667e-6
250	9.914167e-6
500	1.982833e-5
1000	3.965667e-5

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

Calorie (th) (cal)

Energy

Exact conversion

The thermochemical calorie is exactly 4.184 J.

The International Table calorie (4.1868 J) and the 15 °C calorie differ slightly.

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 Calorie (th)

To convert from Therm (thm) to Calorie (th) (cal), multiply the value by 25,216,440.07217973.

Formula: cal = thm × 25,216,440.07217973

Reverse: thm = cal × 3.965667e-8

Step-by-Step Example

Start with your value in Therm. For example: 5 thm
Multiply by the conversion factor: 5 x 25,216,440.07217973
The result is: 126,082,200.360899 cal

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 Calorie (th)

The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.

Common uses: chemistry, nutrition, heating.

Frequently Asked Questions

How many Calorie (th) are in 1 Therm?

There are exactly 25,216,440.07217973 Calorie (th) in 1 Therm. This means the conversion factor from Therm to Calorie (th) is 25,216,440.07217973.

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

The formula to convert Therm to Calorie (th) is: cal = thm × 25,216,440.07217973. For example, to convert 10 Therm to Calorie (th), you would multiply 10 by 25,216,440.07217973.

What is a Therm?