Convert therms to kilojoules

1 thm=105,505.59kJ

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

You have

Equals

105,505.59

Conversion formula

Forward

kilojoules = therms × 105,505.59

Reverse

therms = kilojoules × 9.4782e-6

Example: 10 thm × 105,505.59 = 1,055,055.85 kJ.

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 →

Kilojoule

The kilojoule equals 1000 joules. Used on European nutrition labels (required by EU law alongside kcal), for mechanical work specifications, and some engineering contexts. A 100 g chocolate bar contains about 2100 kJ.

Real-world: 100 g chocolate: ~2100 kJ. EU daily intake (adult): ~8400 kJ. Tesla Model 3 battery: ~270 MJ = 270,000 kJ.

Read full kilojoule reference →

Therm to Kilojoule conversion table

Common therms to kilojoules values for quick reference.

Therm (thm)	Kilojoule (kJ)
1 thm	105,505.59 kJ
10 thm	1,055,055.85 kJ
100 thm	10,550,558.53 kJ
500 thm	52,752,792.65 kJ
1,000 thm	105,505,585.3 kJ
5,000 thm	527,527,926.5 kJ
10,000 thm	1,055,055,853 kJ
50,000 thm	5,275,279,265 kJ
100,000 thm	10,550,558,530 kJ
500,000 thm	52,752,792,650 kJ

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 kilojoules in a therm?

One therm equals 105,505.59 kilojoules.

How do I convert therms to kilojoules?

Multiply the therm value by 105,505.59 to get the equivalent in kilojoules.

What is 100 therms in kilojoules?

100 therms equals 10,550,558.53 kilojoules.

Is a therm bigger than a kilojoule?

Yes. 1 therm equals 105,505.59 kilojoules, so one therm is larger.

How to convert therms to kilojoules without a calculator?

Multiply by 105,505.59 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