How to Convert Joules to Therms (J to thm)
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU. This guide shows how to convert joules into therms by hand, with examples and a quick-reference table.
The conversion
To convert joules to therms, multiply the value by 9.478171e-09. To go the other way, divide by the same number (or multiply by 105,505,585.2569999993). Because the factor is tiny, scientific notation keeps the numbers manageable.
Therms = joules × 9.478171e-09
Worked examples
- 3 J = 2.843451e-8 thm
- 12.5 J = 1.184771e-7 thm
- 75 J = 7.108628e-7 thm
Joules to Therms table
| Joules | Therms |
|---|---|
| 1 J | 9.478171e-9 thm |
| 2 J | 1.895634e-8 thm |
| 5 J | 4.739086e-8 thm |
| 10 J | 9.478171e-8 thm |
| 20 J | 1.895634e-7 thm |
| 25 J | 2.369543e-7 thm |
| 50 J | 4.739086e-7 thm |
| 100 J | 9.478171e-7 thm |
| 250 J | 2.369543e-6 thm |
| 500 J | 4.739086e-6 thm |
| 1,000 J | 9.478171e-6 thm |
Common questions
Is J to thm exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Therms to Joules converter.
Mistakes to avoid
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Joules to Therms Converter or browse all energy converters.
Run your own numbers: Joules to Therms Converter