A pebibyte (PiB) is a unit of data storage equal to 250 bytes, or 1,125,899,906,842,624 bytes. Like kibibyte (KiB) and mebibyte (MiB), pebibyte has a binary prefix to remove any ambiguity when compared to the multiple possible definitions of a petabyte.

A pebibyte is slightly larger than a petabyte (PB), which is 1015 bytes (1,000,000,000,000,000 bytes); a pebibyte is roughly 1.1259 petabytes. A pebibyte is 1,024 tebibytes. 1,024 pebibytes make up a exbibyte.

Due to historical naming conventions in the computer industry, which used decimal (base 10) prefixes for binary (base 2) measurements, the common definition of a petabyte could mean different numbers. When computer engineers first began using the term kilobyte to refer to a binary measurement of 210 bytes (1,024 bytes), the difference between binary and decimal measurements was roughly 2%. As file sizes and storage capacities expanded, so did the difference between the two types of measurements — a pebibyte is more than 11% larger than a petabyte. Using pebibyte to refer specifically to binary measurements helps to address the confusion.

NOTE: For a list of other units of measurement, view this Help Center article.

Updated November 1, 2022 by Brian P.

quizTest Your Knowledge

The CPL metric in advertising stands for cost per ____?

Correct! Incorrect!     View the Lead definition.
More Quizzes →

The Tech Terms Computer Dictionary

The definition of Pebibyte on this page is an original definition written by the team. If you would like to reference this page or cite this definition, please use the green citation links above.

The goal of is to explain computer terminology in a way that is easy to understand. We strive for simplicity and accuracy with every definition we publish. If you have feedback about this definition or would like to suggest a new technical term, please contact us.

Sign up for the free TechTerms Newsletter

How often would you like to receive an email?

You can unsubscribe or change your frequency setting at any time using the links available in each email.

Questions? Please contact us.