Convert terabytes to petabytes
Converting terabytes to petabytes is a common data task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 TB equals 0.001 PB, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert terabytes to petabytes
To convert terabytes to petabytes, multiply the number of terabytes by 0.001. For example, 10 TB × 0.001 = 0.01 PB.
PB = TB × 0.001
- Write down the value in terabytes you want to convert.
- Multiply it by 0.001 (the exact TB→PB factor).
- The result is your value in petabytes. Check it below with the converter or the table.
Conversion table
Common values of terabytes and their equivalents in petabytes:
| TB | PB |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
About these units
Terabyte (TB). A terabyte is 1,000 gigabytes, the capacity of modern hard drives and the scale of personal media libraries. About 250,000 photos fit in one terabyte.
Petabyte (PB). A petabyte is 1,000 terabytes, a scale used by data centers, streaming services and scientific experiments. Large language models are trained on petabytes of text.
Frequently asked questions
How do I convert terabytes to petabytes?
To convert terabytes to petabytes, multiply the number of terabytes by 0.001. For example, 10 TB × 0.001 = 0.01 PB. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many petabytes are in 1 terabyte?
1 TB = 0.001 PB. That is the fixed relationship used by this converter and by international standards.
How many terabytes are in 1 petabyte?
1 PB = 1,000 TB. If you are converting in the opposite direction, use our Petabyte to Terabyte converter for the dedicated table and FAQ.
Is the terabytes to petabytes conversion exact?
Yes — this site uses decimal SI prefixes, so 1 KB = 1,000 bytes exactly. Note that some operating systems report file sizes in binary units (1 KiB = 1,024 bytes), which can make numbers differ slightly from storage labels.
What is terabyte used for?
A terabyte is 1,000 gigabytes, the capacity of modern hard drives and the scale of personal media libraries. About 250,000 photos fit in one terabyte.