**Full name:** attojoule

**Plural form:** attojoules

**Symbol:** aJ

**Category type:** energy

**Scale factor:** 1.0E-18

The SI derived unit for energy is the joule.

1 joule is equal to 1.0E+18 attojoule.

Valid units must be of the **energy** type.

You can use this form to select from known units:

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).

attojoule to megaton [explosive]

attojoule to meter kilogram-force

attojoule to megawatt hour

attojoule to kilocalorie [15 °C]

attojoule to calorie [thermochemical]

attojoule to yoctojoule

attojoule to hectowatt hour

attojoule to millijoule

attojoule to gallon [U.S.] of naphtha type jet fuel

attojoule to kilocalorie [I.T.]