How to Convert Therms to Joules (thm to J)
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 therms into joules by hand, with examples and a quick-reference table.
The conversion
To convert therms to joules, multiply the value by 105,505,585.2569999993. To go the other way, divide by the same number (or multiply by 9.478171e-09). For a quick estimate, multiply by about 110,000,000.
Joules = therms × 105,505,585.2569999993
Worked examples
- 3 thm = 316,516,755.77 J
- 12.5 thm = 1,318,819,815.71 J
- 75 thm = 7,912,918,894.27 J
Therms to Joules table
| Therms | Joules |
|---|---|
| 1 thm | 105,505,585.26 J |
| 2 thm | 211,011,170.51 J |
| 5 thm | 527,527,926.28 J |
| 10 thm | 1,055,055,852.57 J |
| 20 thm | 2,110,111,705.14 J |
| 25 thm | 2,637,639,631.43 J |
| 50 thm | 5,275,279,262.85 J |
| 100 thm | 10,550,558,525.7 J |
| 250 thm | 26,376,396,314.25 J |
| 500 thm | 52,752,792,628.5 J |
| 1,000 thm | 105,505,585,257 J |
Common questions
Is thm to J 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 Joules to Therms converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
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.
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.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
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.
For any value, use the Therms to Joules Converter or browse all energy converters.
Run your own numbers: Therms to Joules Converter