How to Convert Therms to Kilojoules (thm to kJ)
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 kilojoules by hand, with examples and a quick-reference table.
The conversion
To convert therms to kilojoules, multiply the value by 105,505.585257. To go the other way, divide by the same number (or multiply by 9.478171e-06). For a quick estimate, multiply by about 110,000.
Kilojoules = therms × 105,505.585257
Worked examples
- 3 thm = 316,516.76 kJ
- 12.5 thm = 1,318,819.82 kJ
- 75 thm = 7,912,918.89 kJ
Therms to Kilojoules table
| Therms | Kilojoules |
|---|---|
| 1 thm | 105,505.59 kJ |
| 2 thm | 211,011.17 kJ |
| 5 thm | 527,527.93 kJ |
| 10 thm | 1,055,055.85 kJ |
| 20 thm | 2,110,111.71 kJ |
| 25 thm | 2,637,639.63 kJ |
| 50 thm | 5,275,279.26 kJ |
| 100 thm | 10,550,558.53 kJ |
| 250 thm | 26,376,396.31 kJ |
| 500 thm | 52,752,792.63 kJ |
| 1,000 thm | 105,505,585.26 kJ |
Common questions
Is thm to kJ 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 Kilojoules to Therms converter.
Mistakes to avoid
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.
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.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
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.
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.
For any value, use the Therms to Kilojoules Converter or browse all energy converters.
Run your own numbers: Therms to Kilojoules Converter