Convert therms to megajoules

1 thm=105.506MJ

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

You have

Equals

105.5056

Conversion formula

Forward

megajoules = therms × 105.506

Reverse

therms = megajoules × 0.009478

Example: 10 thm × 105.506 = 1,055.06 MJ.

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 →

Megajoule

The megajoule equals 1,000,000 joules. Used for fuel energy content, large-scale mechanical work and in some European natural-gas billing. A litre of petrol contains about 34 MJ of energy.

Real-world: 1 L petrol: ~34 MJ. 1 L diesel: ~38 MJ. Tesla Model 3 full charge: ~270 MJ.

Read full megajoule reference →

Therm to Megajoule conversion table

Common therms to megajoules values for quick reference.

Therm (thm)	Megajoule (MJ)
1 thm	105.506 MJ
10 thm	1,055.06 MJ
100 thm	10,550.56 MJ
500 thm	52,752.79 MJ
1,000 thm	105,505.59 MJ
5,000 thm	527,527.93 MJ
10,000 thm	1,055,055.85 MJ
50,000 thm	5,275,279.27 MJ
100,000 thm	10,550,558.53 MJ
500,000 thm	52,752,792.65 MJ

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 megajoules in a therm?

One therm equals 105.506 megajoules.

How do I convert therms to megajoules?

Multiply the therm value by 105.506 to get the equivalent in megajoules.

What is 100 therms in megajoules?

100 therms equals 10,550.56 megajoules.

Is a therm bigger than a megajoule?

Yes. 1 therm equals 105.506 megajoules, so one therm is larger.

How to convert therms to megajoules without a calculator?

Multiply by 105.51 for a quick estimate; use a calculator for precise results.

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