Convert joules to therms

1 J=9.4782e-9thm

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

You have

Equals

9.4782e-9

Conversion formula

Forward

therms = joules × 9.4782e-9

Reverse

joules = therms × 105,505,585.3

Example: 10 J × 9.4782e-9 = 9.4782e-8 thm.

About both units

From

Joule

The joule is the SI unit of energy, work and heat. Defined as one newton-metre or one watt-second. Named after James Prescott Joule who demonstrated the mechanical equivalent of heat. Lifting a 100 g apple 1 metre requires about 1 J.

Real-world: Lifting a 100 g apple 1 m: ≈ 1 J. 100 kcal snack: 418,400 J. Hand grenade: ~650 kJ.

Read full joule reference →

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 →

Joule to Therm conversion table

Common joules to therms values for quick reference.

Joule (J)	Therm (thm)
1 J	9.4782e-9 thm
10 J	9.4782e-8 thm
100 J	9.4782e-7 thm
500 J	4.7391e-6 thm
1,000 J	9.4782e-6 thm
5,000 J	4.7391e-5 thm
10,000 J	9.4782e-5 thm
50,000 J	0.0004739 thm
100,000 J	0.0009478 thm
500,000 J	0.004739 thm

Tips & common mistakes

Quick tips

1 J = 1 N·m = 1 W·s.
1 kWh = 3,600,000 J (3.6 MJ).
For nutrition 1 kcal = 4.184 kJ.

Avoid these

Confusing joule (energy) with newton (force).
Mixing joule with watt — watt is joule per second.
Using kJ when labels call for kcal on US nutrition.

Frequently asked questions

How many therms in a joule?

One joule equals 9.4782e-9 therms.

How do I convert joules to therms?

Multiply the joule value by 9.4782e-9 to get the equivalent in therms.

What is 100 joules in therms?

100 joules equals 9.4782e-7 therms.

Is a joule bigger than a therm?

No. 1 joule equals 9.4782e-9 therms, so one joule is smaller.

How to convert joules to therms without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

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