Power and Energy
thermtoBTU
Convert US therms (therm) to International Table BTUs (BTU).
Factor1 therm = 99976.13 BTU
Converter
therm
Accepts numbers or expressions, e.g. 150 + 14.7
Result
BTU
Rendered to 6 significant figures.
Formula
Formula
BTU = therm × 99976.13
Multiply any value in US therms by 99976.13 to obtain the value in International Table BTUs.
Worked example
Convert 1 therm to BTU.
- 01Start with 1 therm.
- 02Multiply by the conversion factor: 1 × 99976.13 = 99976.1 BTU.
Result1 therm = 99976.1 BTU
Conversion table
| therm | BTU |
|---|---|
| 1 | 99976 |
| 2 | 1.9995e+5 |
| 5 | 4.9988e+5 |
| 10 | 9.9976e+5 |
| 20 | 1.9995e+6 |
| 50 | 4.9988e+6 |
| 100 | 9.9976e+6 |
| 200 | 1.9995e+7 |
| 500 | 4.9988e+7 |
| 1000 | 9.9976e+7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from therm to BTU?
1 therm equals 99976.13 BTU. To convert, multiply the value in US therms by 99976.13.
How do I convert 1 therm to BTU?
1 therm = 99976.1 BTU. For any value, multiply by 99976.13.
How do I convert BTU back to therm?
Divide by the same factor — or equivalently, multiply by 1.000239e-5. So 1 BTU = 1.00024e-5 therm.
When would I need to convert US therm to International Table BTU?
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).