Therms to Calories (thm to cal) Converter

How to convert therms to calories

Formulacal = thm × 25,210,420.65

Multiply the value in therms by 25,210,420.65. To go the other way, multiply by 3.966613703×10⁻⁸ (or divide by 25,210,420.65).

A therm is larger than a calorie: one therm contains 25,210,420.65 calories.

Worked examples

1 therm (US)1 thm × 25,210,420.65 = 25,210,420.65 cal
5 therms5 thm × 25,210,420.65 = 126,052,103.3 cal
10 therms10 thm × 25,210,420.65 = 252,104,206.5 cal
20 therms20 thm × 25,210,420.65 = 504,208,413 cal
100 therms100 thm × 25,210,420.65 = 2,521,042,065 cal

Therms to calories conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Therms to calories: 0.1–10 thm
Therms (thm)	Calories (cal)
0.1 thm	2,521,042.1 cal
0.25 thm	6,302,605.2 cal
0.5 thm	12,605,210 cal
1 thm	25,210,421 cal
2 thm	50,420,841 cal
3 thm	75,631,262 cal
4 thm	100,841,680 cal
5 thm	126,052,100 cal
6 thm	151,262,520 cal
7 thm	176,472,940 cal
8 thm	201,683,370 cal
9 thm	226,893,790 cal
10 thm	252,104,210 cal

Therms to calories: 12–1,000 thm
Therms (thm)	Calories (cal)
12 thm	302,525,050 cal
15 thm	378,156,310 cal
20 thm	504,208,410 cal
25 thm	630,260,520 cal
30 thm	756,312,620 cal
40 thm	1,008,416,800 cal
50 thm	1,260,521,000 cal
75 thm	1,890,781,500 cal
100 thm	2,521,042,100 cal
250 thm	6,302,605,200 cal
500 thm	12,605,210,000 cal
1,000 thm	25,210,421,000 cal

About the units

Therm (thm)

The US therm is 105,480,400 J, about 100,000 BTU. US gas utilities bill by the therm.

Calorie (cal)

The “small” calorie: exactly 4.184 J (thermochemical definition), roughly the energy to heat one gram of water by 1 °C.

Frequently asked questions

How many calories are in one therm?

There are 25,210,420.65 calories in one therm, and this value is exact by definition.

How do I convert therms to calories?

Multiply the number of therms by 25,210,420.65. For example, 10 thm × 25,210,420.65 = 252,104,206.5 cal.

How many therms are in one calorie?

One calorie equals 3.966613703×10⁻⁸ therms. That is the reverse factor, 1 ÷ 25,210,420.65.

What is 10 therms in calories?

10 thm = 252,104,206.5 cal.

Is this thm to cal converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Therms to Calories Converter