Terabytes to Petabytes
Convert terabytes to petabytes instantly. 1 TB = 0.001 PB. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert terabytes to petabytes
To convert terabytes to petabytes, divide by 1,000 (multiply by 0.001). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
PB = TB × 0.001
Terabytes to Petabytes conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| 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 |
| 20 TB | 0.02 PB |
| 25 TB | 0.025 PB |
| 50 TB | 0.05 PB |
| 100 TB | 0.1 PB |
| 500 TB | 0.5 PB |
| 1,000 TB | 1 PB |
What is a terabyte?
A trillion bytes.
What is a petabyte?
A thousand terabytes, the scale of large data centres.
The formula
PB = TB × 0.001
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Terabytes to Petabytes
- Type the number of terabytes you want to convert.
- Read the result in petabytes straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked petabytes to terabytes page.
Terabytes to Petabytes — frequently asked questions
How many petabytes are in a terabyte?
One terabyte equals 0.001 PB. PB = TB × 0.001
What is the formula to convert terabytes to petabytes?
The formula is PB = TB × 0.001. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert petabytes back to terabytes?
Divide instead of multiplying: one petabyte is 1,000 TB. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this terabytes to petabytes free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the terabytes to petabytes.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error