How many femtojoule in 1 calorie?
The answer is 4.1858E+15.
We assume you are converting between femtojoule and calorie [15 °C].
You can view more details on each measurement unit: femtojoule or
calorie
The SI derived unit for energy is the joule.
1 joule is equal to 1.0E+15 femtojoule, or 0.23890295761862 calorie.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between femtojoules and calories.
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You can do the reverse unit conversion from
calorie to femtojoule, or enter any two units below:

The SI prefix "femto" represents a factor of
10^{-15}, or in exponential notation, 1E-15.

So 1 femtojoule = 10^{-15} joules.

The definition of a joule is as follows:

The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honor of the physicist James Prescott Joule (1818-1889).

››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.

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