In 1 terabytes there are 0.001 petabytes. Meanwhile in 1 petabytes there are 1,000 terabytes. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Petabytes to Terabytes calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert terabytes (TB) to petabytes (PB), pick the unit system you need, then apply one simple rule.
Decimal (SI) conversion (most common for storage drives):
1 PB = 1,000 TB
PB = TB ÷ 1,000
Example: 2,500 TB ÷ 1,000 = 2.5 PB
Binary (base-2) conversion (often used in computing):
1 PiB = 1,024 TiB
If your values use TiB/PiB, convert with: PiB = TiB ÷ 1,024
Tip: If the context says bytes and uses powers of 10, stick with 1 PB = 1,000 TB for accurate TB to PB conversion.
In most storage and cloud billing, 1 petabyte (PB) equals 1,000 terabytes (TB). This is the decimal system (base-10) used by drive makers and many services.
In the binary system (base-2), 1 pebibyte (PiB) equals 1,024 tebibytes (TiB). This is common in operating system reports and some server tools.
PB (petabyte) uses base-10 units, where each step is 1,000.
PiB (pebibyte) uses base-2 units, where each step is 1,024.
They sound similar, but the totals differ once numbers get large.
TB (terabyte) means 1,000,000,000,000 bytes.
TiB (tebibyte) means 1,099,511,627,776 bytes.
A device sold as TB may show fewer TiB in an operating system.
Using decimal units:
Many systems display storage in TiB even when they label it as TB. Since 1 TB is about 0.91 TiB, the number shown looks smaller. Some space also goes to formatting and file system data.
In decimal terms, yes.
But if a report uses binary units, you may see results in PiB and TiB, not PB and TB. Mixing the unit types changes the total.
For decimal storage: PB = TB ÷ 1,000.
Examples:
For decimal storage: TB = PB × 1,000.
Examples:
For binary storage: PiB = TiB ÷ 1,024.
Example: 2,048 TiB = 2 PiB.
For binary storage: TiB = PiB × 1,024.
Example: 1.5 PiB = 1,536 TiB.
A petabyte is massive storage used for large backups, video libraries, logs, and data warehouses. It can hold millions of large photos or many years of documents, depending on file size and format.
Many providers price storage in decimal units (GB, TB, PB). Some tools and reports may show GiB or TiB. Always check whether the numbers use 1,000 or 1,024 steps.
Use the unit your billing or hardware uses. If your OS reports in TiB, plan in TiB to match what you’ll see on-screen. If your vendor quotes TB/PB, plan in those units for purchase and pricing.
Yes, but you must pick a unit system and stick with it. A common approach is to convert TB to bytes (decimal), then to PiB (binary). This avoids unit mix-ups when totals get large.
The Calculate Box tool to convert terabytes to petabytes uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a terabytes value in the box and have it instantly converted to petabytes.