This converter turns terabytes into petabytes instantly, using the exact factor 1 terabyte = 0.001 petabytes. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
One trillion bytes; standard hard-drive capacity. One thousand terabytes, the scale of data centres.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
terabytes- The amount you are converting, measured in terabytes
0.001- The exact number of petabytes in one terabyte
petabytes- The converted result
How it works, step by step
- Enter the number of terabytes you want to convert.
- The value is multiplied by 0.001, the exact conversion factor.
- The result is displayed in petabytes, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 terabytes
Multiply 5 by 0.001. That gives 0.005 petabytes. A quick sanity check: one terabyte is smaller than one petabyte, so the number should get smaller — and it does.
Converting 72 terabytes
72 × 0.001 = 0.072 petabytes. Working backwards, 0.072 ÷ 0.001 returns 72 terabytes, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many petabytes are in one terabyte?
Exactly 0.001. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert terabytes to petabytes?
Petabytes = terabytes × 0.001. To reverse it, divide instead: terabytes = petabytes ÷ 0.001, which is the same as multiplying by 1000.
Is the terabyte bigger than the petabyte?
No. One terabyte is only 0.001 of a petabyte, so the petabyte is the larger unit.
Why does my answer differ slightly from other terabytes to petabytes converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a terabyte?
One trillion bytes; standard hard-drive capacity.
What is a petabyte?
One thousand terabytes, the scale of data centres.
Terabytes to petabytes reference table
| Terabytes | Petabytes |
|---|---|
| 0.5 TB | 0.0005 PB |
| 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 |
| 15 TB | 0.015 PB |
| 20 TB | 0.02 PB |
| 25 TB | 0.025 PB |
| 50 TB | 0.05 PB |
| 75 TB | 0.075 PB |
| 100 TB | 0.1 PB |
| 250 TB | 0.25 PB |
| 500 TB | 0.5 PB |
| 1000 TB | 1 PB |
Exact factor: 1 terabyte = 0.001 petabytes. Values rounded for display.