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Therms to BTU

Convert therm to BTU quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.

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CONVERTED RESULT—
Decimal places
CONVERSION RULE

1 therm equals approximately 100000 BTU.

How to use the Therms to BTU

  1. Enter the number you want to convert.
  2. Confirm the source unit shown beside the input.
  3. Choose decimal precision if you need more or less detail.
  4. Read the converted result.
  5. Copy the result when you need to use it elsewhere.

How the conversion works

1 therm equals approximately 100000 BTU.

For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.

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Common therm to BTU conversions

thermBTU
1 therm100,000 BTU
2 therm200,000 BTU
5 therm500,000 BTU
10 therm1,000,000 BTU
20 therm2,000,000 BTU
50 therm5,000,000 BTU

Example

For example, entering 1 therm gives approximately 100,000 BTU using the rule above. Change the input to test your own value.

Frequently asked questions

The Therms to BTU converts a value from therm to BTU using the conversion relationship described on this page.
Enter your value, review the source and destination units, choose the decimal precision and read or copy the result.
1 therm equals approximately 100000 BTU.
Use enough precision for your purpose. Everyday estimates usually need fewer decimal places; technical work may require more.
It can be a useful reference calculation, but safety-critical, regulated, contractual or specialized work should be verified against the applicable authoritative standard.

Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.

Page reviewed: August 24, 2026.