# ››Convert zettabyte to gigabyte

 zettabyte gigabyte

How many zettabyte in 1 gigabyte? The answer is 1.073741824E-12.
We assume you are converting between zettabyte and gigabyte.
You can view more details on each measurement unit:
zettabyte or gigabyte
The main non-SI unit for computer data storage is the byte.
1 byte is equal to 1.0E-21 zettabyte, or 9.31322574615E-10 gigabyte.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between zettabytes and gigabytes.
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# ››Definition: Zettabyte

The SI prefix "zetta" represents a factor of 1021, or in exponential notation, 1E21.

So 1 zettabyte = 1021 bytes.

The definition of a byte is as follows:

A byte is the basic unit of measurement of information storage in computer science. In many computer architectures it is a unit of memory addressing, consisting of 8 bits.

Since computer memory comes in base two rather than 10, a large portion of the software and computer industry use binary estimates of the SI-prefixed quantities, while producers of computer storage devices prefer the SI values. This is why a computer hard drive advertised with a "100 GB" decimal storage capacity actually contains no more than 93 GB of 8-bit (power of 2) addressable storage.

# ››Definition: Gigabyte

A gigabyte is a unit of information or computer storage meaning approximately 1.07 billion bytes. This is the definition commonly used for computer memory and file sizes. Microsoft uses this definition to display hard drive sizes, as do most other operating systems and programs by default.

Since 1999, the IEC recommends that this unit should instead be called a "gibibyte" (abbreviated GiB). The difference between units based on SI and binary prefixes increases exponentially — in other words, an SI kilobyte is nearly 98% as much as a kibibyte, but a megabyte is under 96% as much as a mebibyte, and a gigabyte is just over 93% as much as a gibibyte. This means that a 500 GB hard disk drive would appear as "465 GB".

Most users prefer to convert units using the most common definition, so this site uses the non-SI form.

# ››Metric conversions and more

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!