Power and Energy
thermtokcal
Convert US therms (therm) to kilocalories (kcal).
Factor1 therm = 25210.42 kcal
Converter
therm
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kcal
Rendered to 6 significant figures.
Formula
Formula
kcal = therm × 25210.42
Multiply any value in US therms by 25210.42 to obtain the value in kilocalories.
Worked example
Convert 1 therm to kcal.
- 01Start with 1 therm.
- 02Multiply by the conversion factor: 1 × 25210.42 = 25210.4 kcal.
Result1 therm = 25210.4 kcal
Conversion table
| therm | kcal |
|---|---|
| 1 | 25210 |
| 2 | 50421 |
| 5 | 1.2605e+5 |
| 10 | 2.5210e+5 |
| 20 | 5.0421e+5 |
| 50 | 1.2605e+6 |
| 100 | 2.5210e+6 |
| 200 | 5.0421e+6 |
| 500 | 1.2605e+7 |
| 1000 | 2.521e+7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from therm to kcal?
1 therm equals 25210.42 kcal. To convert, multiply the value in US therms by 25210.42.
How do I convert 1 therm to kcal?
1 therm = 25210.4 kcal. For any value, multiply by 25210.42.
How do I convert kcal back to therm?
Divide by the same factor — or equivalently, multiply by 3.966614e-5. So 1 kcal = 3.96661e-5 therm.
When would I need to convert US therm to kilocalorie?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).