Therms to BTU
Convert therms to btu instantly. 1 thm = 100,000 BTU. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert therms to btu
To convert therms to btu, multiply by 100,000. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
BTU = thm × 100,000
Therms to BTU conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Therms | BTU |
|---|---|
| 1 thm | 100,000 BTU |
| 2 thm | 200,000 BTU |
| 3 thm | 300,000 BTU |
| 5 thm | 500,000 BTU |
| 10 thm | 1,000,000 BTU |
| 20 thm | 2,000,000 BTU |
| 25 thm | 2,500,000 BTU |
| 50 thm | 5,000,000 BTU |
| 100 thm | 10,000,000 BTU |
| 500 thm | 50,000,000 BTU |
| 1,000 thm | 100,000,000 BTU |
What is a therm?
100,000 BTU. The unit on US and UK gas bills.
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
The formula
BTU = thm × 100,000
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Therms to BTU
- Type the number of therms you want to convert.
- Read the result in btu straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked btu to therms page.
Therms to BTU — frequently asked questions
How many btu are in a therm?
One therm equals 100,000 BTU. BTU = thm × 100,000
What is the formula to convert therms to btu?
The formula is BTU = thm × 100,000. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert btu back to therms?
Divide instead of multiplying: one btu is 1e-05 thm. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this therms to btu free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error