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calorie [15 °C] calorie [I.T.] calorie [nutritional] calorie [thermochemical] |
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attojoule |

How many calorie in 1 attojoule?
The answer is 2.3890295761862E-19.

We assume you are converting between **calorie [15 °C]** and **attojoule**.

You can view more details on each measurement unit:

calorie or
attojoule

The SI derived unit for **energy** is the joule.

1 joule is equal to 0.23890295761862 calorie, or 1.0E+18 attojoule.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between calories and attojoules.

Type in your own numbers in the form to convert the units!

1 calorie to attojoule = 4.1858E+18 attojoule

2 calorie to attojoule = 8.3716E+18 attojoule

3 calorie to attojoule = 1.25574E+19 attojoule

4 calorie to attojoule = 1.67432E+19 attojoule

5 calorie to attojoule = 2.0929E+19 attojoule

6 calorie to attojoule = 2.51148E+19 attojoule

7 calorie to attojoule = 2.93006E+19 attojoule

8 calorie to attojoule = 3.34864E+19 attojoule

9 calorie to attojoule = 3.76722E+19 attojoule

10 calorie to attojoule = 4.1858E+19 attojoule

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

calorie to kilogram calorie

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calorie to kilogram-force meter

calorie to megajoule

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calorie to petajoule

calorie to hartree

calorie to Btu

calorie to zettawatthour

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.

The SI prefix "atto" represents a factor of
10^{-18}, or in exponential notation, 1E-18.

So 1 attojoule = 10^{-18} 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).

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