BTU to Therms Converter

Convert BTU and therms instantly.

Free online bidirectional converter with a swap button, quick reference table, and copyable results.

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How This Tool Works

The BTU to Therms Converter converts between British Thermal Units (BTU) and therms using the standard relationship 1 therm = 100,000 BTU. Enter a value in BTU and the tool multiplies it by 0.00001 to show therms.

The reverse direction converts therms back to BTU by multiplying by 100,000. For example, 500,000 BTU equals 5 therms.

  • Input: BTU or therms.
  • Conversion factor: 1 BTU = 0.00001 therms.
  • Output: Equivalent energy in the selected unit.

Why This Matters for Energy Planning

BTU and therms are both energy units, but they appear in different contexts. HVAC equipment and load calculations often use BTU, while natural gas usage and billing commonly use therms. Converting between them helps keep equipment sizing, usage estimates, and utility comparisons aligned.

Use this converter when a specification, quote, or bill uses one unit and your planning worksheet uses the other.

Common Mistakes to Avoid

  • Do not treat BTU and therms as equal: 1 therm is 100,000 BTU.
  • Watch BTU versus BTU/hr: BTU is an energy amount, while BTU/hr is a rate of energy use.
  • Round after converting: Keep enough precision for estimates before rounding for reports or quotes.

Frequently Asked Questions

Common questions about the BTU to Therms Converter

Energy is the capacity to do work, measured in joules (SI unit), calories, BTU, kilowatt-hours, and other units depending on the application.
Learn More

Sources & References

International System of Units (SI): energy, work and heat

Energy, work and heat is measured in the joule (J); 1 cal = 4.184 J. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
→Source: NIST — International System of Units (SI)

International System of Units (SI)

Authoritative definitions for energy, work and heat, from the BIPM SI Brochure (9th edition), the defining reference for the SI.
→Source: BIPM — SI Brochure (9th ed.)

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