Data Storage converter
Terabytes to Petabytes
Converting Terabytes to Petabytes is a single multiplication when you know the factor. One TB equals 0.001 PB, so multiply the value in TB by 0.001. The calculator below works in both directions and accepts decimals.
Formula 1 TB = 0.001 PB
Need the other direction? Petabytes to Terabytes.
How to convert Terabytes to Petabytes
A decimal terabyte is 10^12 bytes; a tebibyte is 2^40 bytes, about 9.95% more. A decimal petabyte is 10^15 bytes; a pebibyte is 2^50 bytes.
To convert Terabytes to Petabytes, multiply the value in TB by 0.001. For example, 10 TB × 0.001 = 0.01 PB. This works because the ratio between the two units is constant for every value in data storage.
Worked examples
| TB | PB |
|---|---|
| 1 TB | 0.001 PB |
| 2.5 TB | 0.0025 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 |
Reverse conversion
| PB | TB |
|---|---|
| 1 PB | 1,000 TB |
| 5 PB | 5,000 TB |
| 10 PB | 10,000 TB |
| 25 PB | 25,000 TB |
| 50 PB | 50,000 TB |
| 100 PB | 100,000 TB |
When this conversion is useful
This is the calculation you need when you are sizing a backup, a download or a storage plan and the units are mixed. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 TB is 1 PB.
Is the conversion exact?
It depends on the definition. This converter uses decimal units (1 kB = 1,000 bytes) and a bit-based base; binary units such as KiB and GiB are separate units in the list.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
TB to PB conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Terabytes (TB) | Petabytes (PB) |
|---|---|
| 1 TB | 0.001 PB |
| 2 TB | 0.002 PB |
| 3 TB | 0.003 PB |
| 4 TB | 0.004 PB |
| 5 TB | 0.005 PB |
| 6 TB | 0.006 PB |
| 7 TB | 0.007 PB |
| 8 TB | 0.008 PB |
| 9 TB | 0.009 PB |
| 10 TB | 0.01 PB |
| 11 TB | 0.011 PB |
| 12 TB | 0.012 PB |
| 13 TB | 0.013 PB |
| 14 TB | 0.014 PB |
| 15 TB | 0.015 PB |
| 16 TB | 0.016 PB |
| 17 TB | 0.017 PB |
| 18 TB | 0.018 PB |
| 19 TB | 0.019 PB |
| 20 TB | 0.02 PB |
| 21 TB | 0.021 PB |
| 22 TB | 0.022 PB |
| 23 TB | 0.023 PB |
| 24 TB | 0.024 PB |
| 25 TB | 0.025 PB |
| 26 TB | 0.026 PB |
| 27 TB | 0.027 PB |
| 28 TB | 0.028 PB |
| 29 TB | 0.029 PB |
| 30 TB | 0.03 PB |
| 31 TB | 0.031 PB |
| 32 TB | 0.032 PB |
| 33 TB | 0.033 PB |
| 34 TB | 0.034 PB |
| 35 TB | 0.035 PB |
| 36 TB | 0.036 PB |
| 37 TB | 0.037 PB |
| 38 TB | 0.038 PB |
| 39 TB | 0.039 PB |
| 40 TB | 0.04 PB |
| 41 TB | 0.041 PB |
| 42 TB | 0.042 PB |
| 43 TB | 0.043 PB |
| 44 TB | 0.044 PB |
| 45 TB | 0.045 PB |
| 46 TB | 0.046 PB |
| 47 TB | 0.047 PB |
| 48 TB | 0.048 PB |
| 49 TB | 0.049 PB |
| 50 TB | 0.05 PB |
| 60 TB | 0.06 PB |
| 70 TB | 0.07 PB |
| 80 TB | 0.08 PB |
| 90 TB | 0.09 PB |
| 100 TB | 0.1 PB |
Frequently asked questions
How many Petabytes are in 1 Terabytes?
1 TB equals 0.001 PB.
How do I convert Terabytes to Petabytes?
Multiply the TB value by 0.001. Example: 25 TB = 0.025 PB.
What is 2.5 TB in PB?
2.5 TB = 0.0025 PB.
Is the TB to PB conversion exact?
It depends on the definition. This converter uses decimal units (1 kB = 1,000 bytes) and a bit-based base; binary units such as KiB and GiB are separate units in the list.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.