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Therm Converters

Convert therms to and from BTU, joules, kilowatt-hours, and other energy units.

What this tool does

Convert therms to and from BTU, joules, kilowatt-hours, and other energy units. Type an amount in therms (EC), choose the units, and the tool converts it to british thermal units (International Table). It offers 10 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 10 options, including Therm (EC), Therm (US), British thermal unit (International Table), Joule, Kilojoule, Megajoule. Starts as Therm (EC).
  • To: Choose one of the same 10 units as "From". Starts as British thermal unit (International Table).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from therms (EC) to british thermal units (International Table):

  • 1 thm (EC) ≈ 100,000.393096 BTU (IT)
  • 5 thm (EC) ≈ 500,001.965479 BTU (IT)
  • 10 thm (EC) ≈ 1,000,003.93096 BTU (IT)
  • 50 thm (EC) ≈ 5,000,019.65479 BTU (IT)
  • 100 thm (EC) ≈ 10,000,039.3096 BTU (IT)

Multiply the number of therms (EC) by about 100,000.393096 to get british thermal units (International Table). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Therm (EC): NIST SP 811 (2008), Appendix B.8. British thermal unit (International Table): exact by definition.

Limitations

  • Converts units of energy only. It does not work out energy from power, time, voltage or charge.
  • Cubic feet of natural gas are not converted, because the energy in gas varies with its composition.

FAQs

Q: How many British thermal units (International Table) are in one therm (EC)?
A: One therm (EC) is about 100000.39 British thermal units (International Table). Change the value to convert any amount; the other units are listed below the result.
Q: Which definition of the units does this page use?
A: The page starts with the EC therm, which is 105.506 MJ, or 100,000 International Table BTU to within half a BTU. The US therm is 105.4804 MJ and is listed separately. BTU here is the International Table BTU (about 1055.06 J), the usual definition for heating and cooling. The thermochemical BTU is slightly smaller. Calories here are thermochemical calories (1 cal = 4.184 J exactly).
Q: Can I convert from British thermal units (International Table) to therms (EC)?
A: Yes. Choose British thermal unit (International Table) in the From box and therm (EC) in the To box. One British thermal unit (International Table) is about 9.9999607 × 10⁻⁶ therms (EC).

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