How many calorie in 1 Btu?
The answer is 252.05597496297.
We assume you are converting between calorie [15 °C] and British thermal unit.
You can view more details on each measurement unit: calorie or
Btu
The SI derived unit for energy is the joule.
1 joule is equal to 0.23890295761862 calorie, or 0.00094781707774915 Btu.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between calories and Btus.
Type in your own numbers in the form to convert the units!

››Quick conversion chart of calorie to Btu

1 calorie to Btu = 0.00397 Btu

10 calorie to Btu = 0.03967 Btu

50 calorie to Btu = 0.19837 Btu

100 calorie to Btu = 0.39674 Btu

200 calorie to Btu = 0.79347 Btu

500 calorie to Btu = 1.98369 Btu

1000 calorie to Btu = 3.96737 Btu

››Want other units?

You can do the reverse unit conversion from
Btu to calorie, or enter any two units below:

15 °C calorie: the amount of energy required to warm 1 g of air-free water from 14.5 °C to 15.5 °C at a constant pressure of 101.325 kPa (1 atm). Experimental values of this calorie ranged from 4.1852 J to 4.1858 J. The CIPM in 1950 published a mean experimental value of 4.1855 J, noting an uncertainty of 0.0005 J.

››Definition: Btu

The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it isgenerally only used for heating systems). The SI unit is the joule (J), which is used by most other countries.

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