Calories (thermoc.) to Btu conversion

There is more than one type of Btu. Please use the appropriate variation from the list below.

  1. Calories (thermoc.) to Btu (15°C)

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  2. Calories (thermoc.) to Btu (15.6°C)

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  3. Calories (thermoc.) to Btu (15.8°C, Canada)

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  4. Calories (thermoc.) to Btu (15.8°C, ISO)

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  5. Calories (thermoc.) to Btu (3.9°C)

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  6. Calories (thermoc.) to Btu (I.T.)

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  7. Calories (thermoc.) to Btu (I.T., pre-1956)

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  8. Calories (thermoc.) to Btu (mean)

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  9. Calories (thermoc.) to Btu (thermoc.)

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Calories (thermoc.)

The thermochemical calorie was defined in 1930 by Frederick Rossini as 4.1833 joules. With the change to absolute electrical units in 1948, the thermochemical calorie was redefined to 4.184 joules, to keep the same quantity of energy represented by it

Btu

One BTU is the energy required to heat 1 avoirdupois pound of liquid water by 1 degree Fahrenheit, at a pressure of one atmosphere.