# ››Convert calorie [15 °C] to British thermal unit

 calorie Btu

 Did you mean to convert calorie [15 °C] calorie [I.T.] calorie [nutritional] calorie [thermochemical] to British thermal unit Btu [thermochemical]

How many calorie in 1 Btu? The answer is 252.055974963.
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 0.238902957619 calorie, or 0.000947817077749 Btu.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between calories and Btus.
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# ››Definition: Calorie

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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ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!