Terabytes to Petabytes
Convert terabytes to petabytes instantly — one terabyte is 0.001 petabytes.
| Terabytes | Petabytes |
|---|---|
| 1 TB | 0.001 PB |
| 2 TB | 0.002 PB |
| 3 TB | 0.003 PB |
| 5 TB | 0.005 PB |
| 10 TB | 0.01 PB |
| 25 TB | 0.025 PB |
| 50 TB | 0.05 PB |
| 100 TB | 0.1 PB |
How to use
- Enter a value in the Terabytes field.
- The Petabytes figure appears immediately — no button to press.
- Typing in the Petabytes field converts back to Terabytes the same way.
- Use the reference table for the values that come up most often.
Terabytes to Petabytes formula
To convert terabytes to petabytes, multiply by 0.001.
PB = TB × 0.001
Put another way, one terabyte is exactly 1/1,000 of a petabyte.
Why this factor: the terabyte and the petabyte are both defined against the byte, so dividing one definition by the other gives 0.001 directly. Both definitions are set out in full below.
To go the other way, divide by 0.001 — or use the Petabytes to Terabytes converter, which is the same calculation reversed.
Worked example
Start with 64 TB. Multiply by 0.001 to get 0.064 PB.
64 TB × 0.001 = 0.064 PB
The converter above does this for any value you type, in either direction.
What is a terabyte?
A terabyte is one trillion bytes, the standard capacity unit for hard drives and large archives.
Definition: Exactly 1×10¹² bytes under SI prefixes. The binary tebibyte (TiB) is about 1.1×10¹² bytes.
Where it is used: Hard drive and SSD capacity, backup archives, and database sizes.
Worth knowing: A 1 TB drive reports as roughly 931 GiB in an operating system that counts in powers of two — the storage is not missing, just labelled differently.
What is a petabyte?
A petabyte is a thousand terabytes — the scale of large-scale data infrastructure.
Definition: Exactly 1×10¹⁵ bytes under SI prefixes.
Where it is used: Data-centre and cloud storage footprints, scientific datasets, and media archives.
Terabytes vs Petabytes
The terabyte and the petabyte belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many petabytes are in a terabyte?
One terabyte equals 0.001 petabytes.
What is the formula to convert terabytes to petabytes?
Multiply the number of terabytes by 0.001. To reverse it, divide by 0.001 instead.
How do I convert petabytes back to terabytes?
Divide by 0.001, which is the same as multiplying by 1000.
How many petabytes are in 10 terabytes?
10 TB works out to 0.01 PB.
Is there anything to watch out for with terabytes?
A 1 TB drive reports as roughly 931 GiB in an operating system that counts in powers of two — the storage is not missing, just labelled differently.
How is the terabyte defined?
Exactly 1×10¹² bytes under SI prefixes. The binary tebibyte (TiB) is about 1.1×10¹² bytes.