What is a Petabyte?

The petabyte (PB) equals 1,000 terabytes (10¹⁵ bytes decimal) and rates large data centers, scientific research archives, and major social-media storage systems worldwide. The Large Hadron Collider generates about 30 petabytes of data per year, the U.S. Library of Congress digital collection is in the petabytes range, and major cloud-storage providers manage exabytes (1,000 PB) of data across their fleets. A petabyte could store roughly 250 million MP3 songs or about 13.3 years of HD video. The petabyte relates to the terabyte (1,000 TB = 1 PB), the exabyte (1,000 PB = 1 EB), and the gigabyte (10⁶ GB = 1 PB). Modern hyperscale data centers (Google, Amazon AWS, Microsoft Azure, Meta) store hundreds of petabytes per facility. The next consumer milestone — the petabyte hard drive — is expected within the next decade.

Visual reference for how the petabyte relates to other data units. Each row links to the full converter for that pair.

• Cloud-provider storage capacity
• Scientific datasets (CERN, genomics)
• Media archives and streaming libraries

• ✓1 PB = 1000 TB = 10¹⁵ B.
• ✓PiB uses binary multiples — rare in everyday context.
• ✓Scale beyond PB: EB (exabyte, 10¹⁸) and ZB (zettabyte, 10²¹).

• ✗Using PB when TB suffices — everyday use rarely needs PB.
• ✗Mixing PB and PiB — 12.6% difference.
• ✗Ignoring tape vs spinning-disk storage economics at PB scale.