Convert therms to calories

1 thm=25,216,440.08cal

Use the converter below to change any therms value into calories instantly — with formula, conversion table, and real-world examples.

You have

Equals

25,216,440.08

Conversion formula

Forward

calories = therms × 25,216,440.08

Reverse

therms = calories × 3.9657e-8

Example: 10 thm × 25,216,440.08 = 252,164,400.81 cal.

About both units

From

Therm

thm

The therm equals 100,000 BTU or 105.5 megajoules. Used in US and UK natural-gas billing. A typical UK home uses 200–500 therms per year for heating.

Real-world: UK home heating: 200–500 therms/year. 1 therm = about $1.50 US (2024) or £1.00 UK.

Read full therm reference →

Calorie

cal

The gram calorie (small calorie) equals 4.184 joules — the energy to raise 1 g of water by 1 °C. It is a scientific unit, distinct from the nutrition "Calorie" (kcal). Largely replaced by joules in modern science.

Real-world: Raising 1 g of water 1 °C: 1 cal. A 100 kcal snack = 100,000 small calories.

Read full calorie reference →

Therm to Calorie conversion table

Common therms to calories values for quick reference.

Therm (thm)	Calorie (cal)
1 thm	25,216,440.08 cal
10 thm	252,164,400.81 cal
100 thm	2,521,644,008.13 cal
500 thm	12,608,220,040.63 cal
1,000 thm	25,216,440,081.26 cal
5,000 thm	126,082,200,406.31 cal
10,000 thm	252,164,400,812.62 cal
50,000 thm	1,260,822,004,063.1 cal
100,000 thm	2,521,644,008,126.2 cal
500,000 thm	12,608,220,040,630.98 cal

Tips & common mistakes

Quick tips

1 therm = 100,000 BTU = 105.5 MJ = 29.3 kWh.
UK bills often quote both therms and kWh.
In metric-dominant EU, gas is billed in kWh or m³.

Avoid these

Comparing therms and kWh without conversion on a mixed-unit bill.
Assuming therms are used globally — only US and UK.
Using BTU when bill shows therms — factor of 100,000.

Frequently asked questions

How many calories in a therm?

One therm equals 25,216,440.08 calories.

How do I convert therms to calories?

Multiply the therm value by 25,216,440.08 to get the equivalent in calories.

What is 100 therms in calories?

100 therms equals 2,521,644,008.13 calories.

Is a therm bigger than a calorie?

Yes. 1 therm equals 25,216,440.08 calories, so one therm is larger.

How to convert therms to calories without a calculator?

Multiply by 25,216,440.08 for a quick estimate; use a calculator for precise results.

Related energy conversions

📊 See full comparison matrix →

Conversions in other categories

WeightKilogram → Pound LengthKilometer → Mile TemperatureCelsius → Fahrenheit VolumeLiter → US Gallon AreaSquare Meter → Square Foot SpeedKilometer per Hour → Mile per Hour PressureBar → Pound per Square Inch PowerKilowatt → Mechanical Horsepower