How many zettajoule in 1 kilowatt hour?
The answer is 3.6E-15.

We assume you are converting between **zettajoule** and **kilowatt hour**.

You can view more details on each measurement unit:

zettajoule or
kilowatt hour

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

1 joule is equal to 1.0E-21 zettajoule, or 2.77777777778E-7 kilowatt hour.

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

Use this page to learn how to convert between zettajoules and kilowatt hours.

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

The SI prefix "zetta" represents a factor of
10^{21}, or in exponential notation, 1E21.

So 1 zettajoule = 10^{21} 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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