How to Convert Therms to Calories (thm to cal)
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 calories by hand, with examples and a quick-reference table.
The conversion
To convert therms to calories, multiply the value by 25,216,440.0709847026. To go the other way, divide by the same number (or multiply by 3.965667e-08). For a quick estimate, multiply by about 25,000,000.
Calories = therms × 25,216,440.0709847026
Worked examples
- 3 thm = 75,649,320.21 cal
- 12.5 thm = 315,205,500.89 cal
- 75 thm = 1,891,233,005.32 cal
Therms to Calories table
| Therms | Calories |
|---|---|
| 1 thm | 25,216,440.07 cal |
| 2 thm | 50,432,880.14 cal |
| 5 thm | 126,082,200.35 cal |
| 10 thm | 252,164,400.71 cal |
| 20 thm | 504,328,801.42 cal |
| 25 thm | 630,411,001.77 cal |
| 50 thm | 1,260,822,003.55 cal |
| 100 thm | 2,521,644,007.1 cal |
| 250 thm | 6,304,110,017.75 cal |
| 500 thm | 12,608,220,035.49 cal |
| 1,000 thm | 25,216,440,070.98 cal |
Common questions
Is thm to cal 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 Calories 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.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
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.
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.
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 Calories Converter or browse all energy converters.
Run your own numbers: Therms to Calories Converter