Calories to Therms Conversion

Enter the energy in calories below to get the value converted to therms.

Results in Therms:
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1 cal = 3.9657E-8 therms
Hint: use a scientific notation calculator to convert E notation to decimal
Do you want to convert therms to calories?

How to Convert Calories to Therms

To convert a calorie measurement to a therm measurement, multiply the energy by the conversion ratio.

Since one calorie is equal to 3.9657E-8 therms, you can use this simple formula to convert:

therms = calories × 3.9657E-8

The energy in therms is equal to the calories multiplied by 3.9657E-8.

For example, here's how to convert 50,000,000 calories to therms using the formula above.
50,000,000 cal = (50,000,000 × 3.9657E-8) = 1.982833 therms

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


One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as cal; for example, 1 calorie can be written as 1 cal.


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.

Calorie to Therm Conversion Table

Calorie measurements converted to therms
Calories Therms
1 cal 0.000000039657
2 cal 0.000000079313
3 cal 0.00000011897
4 cal 0.00000015863
5 cal 0.00000019828
6 cal 0.00000023794
7 cal 0.0000002776
8 cal 0.00000031725
9 cal 0.00000035691
10 cal 0.00000039657
100 cal 0.0000039657
1,000 cal 0.000039657
10,000 cal 0.000397
100,000 cal 0.003966
1,000,000 cal 0.039657
10,000,000 cal 0.396567
100,000,000 cal 3.9657

More Calorie & Therm Conversions