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British Thermal Unit Converters

Convert BTU to joules, calories, kilowatt-hours, therms and other energy units for HVAC and heating work.

What this tool does

Convert BTU to joules, calories, kilowatt-hours, therms and other energy units for HVAC and heating work. Type an amount in british thermal units (International Table), choose the units, and the tool converts it to joules. It offers 12 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 12 options, including British thermal unit (International Table), British thermal unit (thermochemical), Joule, Kilojoule, Megajoule, Calorie (thermochemical). Starts as British thermal unit (International Table).
  • To: Choose one of the same 12 units as "From". Starts as Joule.

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 british thermal units (International Table) to joules:

  • 1 BTU (IT) = 1,055.05585262 J
  • 5 BTU (IT) = 5,275.2792631 J
  • 10 BTU (IT) = 10,550.5585262 J
  • 50 BTU (IT) = 52,752.792631 J
  • 100 BTU (IT) = 105,505.585262 J

Multiply the number of british thermal units (International Table) by 1,055.05585262 to get joules. Both units are exact definitions, so 1,055.05585262 is the exact factor: 1 BTU (IT) = 1,055.05585262 J.

Sources: British thermal unit (International Table): exact by definition. Joule: SI Brochure, 9th edition (2019).

Limitations

  • Converts units of energy only. It does not work out energy from power, time, voltage or charge.

FAQs

Q: How many joules are in one British thermal unit (International Table)?
A: One British thermal unit (International Table) is about 1055.0559 joules. 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: 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). The therm shown is the EC therm (105.506 MJ, very nearly 100,000 BTU).
Q: Can I convert from joules to British thermal units (International Table)?
A: Yes. Choose joule in the From box and British thermal unit (International Table) in the To box. One joule is about 0.00094781712 British thermal units (International Table).

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