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Power and Energy

BTUtotherm

Convert International Table BTUs (BTU) to US therms (therm).

Factor1 BTU = 1.000239e-5 therm

Converter

BTU

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1.00024therm

Rendered to 6 significant figures.

Formula

Formula
therm = BTU × 1.000239e-5

Multiply any value in International Table BTUs by 1.000239e-5 to obtain the value in US therms.

Worked example

Convert 100000 BTU to therm.

  1. 01Start with 100000 BTU.
  2. 02Multiply by the conversion factor: 100000 × 1.000239e-5 = 1.00024 therm.
Result100000 BTU = 1.00024 therm

Conversion table

BTUtherm
11.0002e-5
22.0005e-5
55.0012e-5
100.00010002
200.00020005
500.00050012
1000.0010002
2000.0020005
5000.0050012
10000.010002

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU to therm?
1 BTU equals 1.000239e-5 therm. To convert, multiply the value in International Table BTUs by 1.000239e-5.
How do I convert 1 BTU to therm?
1 BTU = 1.00024e-5 therm. For any value, multiply by 1.000239e-5.
How do I convert therm back to BTU?
Divide by the same factor — or equivalently, multiply by 99976.13. So 1 therm = 99976.1 BTU.
When would I need to convert International Table BTU to US therm?
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).

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