Terabyte to Petabyte
Convert terabyte (TB) to petabyte (PB) instantly. Understand file sizes and storage plans.
Terabyte → Petabyte
0.000977
PB
1 TB = 0.000977 PB
Frequently asked questions
1,000 TB decimal, or 1,024 TiB in binary terms. At this scale the gap between the two conventions reaches 12.6% — the largest of any commonly used prefix pair, which is why enterprise storage contracts specify the unit explicitly.
Institutions rather than individuals. Data centres and cloud providers, scientific instruments in genomics and particle physics, video platforms and media archives, and large enterprise data lakes in telecom, banking and retail. A petabyte is roughly a thousand 1 TB drives.
Exabyte (10^18), zettabyte (10^21) and yottabyte (10^24), each a factor of 1,000 above the last. Global annual data creation is now measured in zettabytes, two full steps above the petabyte. The binary equivalents are exbi, zebi and yobi.
A thousand terabytes
Decimal: 1 PB = 1,000 TB Binary: 1 PiB = 1,024 TiB
At this scale the binary-decimal gap reaches 12.6%, the largest of any commonly used prefix pair — a petabyte and a pebibyte differ by more than an eighth.
Who actually uses petabytes
This is not consumer territory. A petabyte is roughly a thousand 1 TB drives, and the contexts where it appears are institutional:
Data centres and cloud storage. Individual storage clusters at major providers run to many petabytes, and total capacity across a provider reaches exabytes.
Scientific instruments. Genomics, particle physics and radio astronomy generate data at rates that make petabyte-scale storage routine. Large telescope arrays and colliders produce more raw data than can be stored, which is why they discard most of it in real time and keep only what triggers an event of interest.
Video platforms and media archives. A broadcaster's archive, or the uploaded content of a large video service, runs to petabytes.
Large enterprise data lakes, particularly in telecom, banking and retail, where transaction and log data accumulates continuously.
Backup and archival systems for any of the above.
The full ladder
Decimal, each step a factor of 1,000:
- kilobyte (KB) — 10³
- megabyte (MB) — 10⁶
- gigabyte (GB) — 10⁹
- terabyte (TB) — 10¹²
- petabyte (PB) — 10¹⁵
- exabyte (EB) — 10¹⁸
- zettabyte (ZB) — 10²¹
- yottabyte (YB) — 10²⁴
Global annual data creation is now measured in zettabytes, two full steps above the petabyte.
Binary equivalents run kibi, mebi, gibi, tebi, pebi (PiB), exbi, zebi, yobi.
What a petabyte holds
- 1080p video at 4 GB per hour: about 250,000 hours, or 28 years of continuous playback
- Photos at 5 MB: about 200 million
- Plain text: roughly 500 billion pages
Why the gap matters at this scale
A storage procurement specified as "5 PB" means 5,000 TB decimal to a vendor and 5,120 TiB to a system administrator reading the filesystem. The 120 TB discrepancy — worth a substantial amount of money and more than most organisations' entire storage estate a decade ago — is entirely a question of which definition the contract used.
At petabyte scale, contracts specify the unit explicitly for exactly this reason, and the IEC binary prefixes are used far more consistently in enterprise storage documentation than in consumer contexts.
Cost at this scale
Storage cost per terabyte falls with scale but never to zero, and the ongoing costs dominate: power, cooling, replacement of failed drives, replication for durability, and the network to move data in and out. Cloud object storage at petabyte scale is priced in tiers with substantial discounts, and the egress cost of retrieving a petabyte typically exceeds the cost of storing it for a year — which is the single most important economic fact about large-scale cloud storage.