Petabytes to Bytes
An instant petabytes-to-bytes converter, with the formula and a reference table below.
| Petabytes | Bytes |
|---|---|
| 1 PB | 1e+15 B |
| 2 PB | 2e+15 B |
| 3 PB | 3e+15 B |
| 5 PB | 5e+15 B |
| 10 PB | 1e+16 B |
| 25 PB | 2.5e+16 B |
| 50 PB | 5e+16 B |
| 100 PB | 1e+17 B |
How to use
- Enter a value in the Petabytes field.
- The Bytes figure appears immediately — no button to press.
- Typing in the Bytes field converts back to Petabytes the same way.
- Use the reference table for the values that come up most often.
Petabytes to Bytes formula
Converting petabytes to bytes is a single multiplication by 1e+15.
B = PB × 1e+15
Why this factor: the petabyte and the byte are both defined against the byte, so dividing one definition by the other gives 1e+15 directly. Both definitions are set out in full below.
To go the other way, divide by 1e+15 — or use the Bytes to Petabytes converter, which is the same calculation reversed.
Worked example
Given 64 PB, multiplying by 1e+15 yields 6.4e+16 B.
64 PB × 1e+15 = 6.4e+16 B
The converter above does this for any value you type, in either direction.
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.
What is a byte?
A byte is eight bits — historically the space for one text character, and the standard unit of file size.
Definition: Exactly 8 bits.
Where it is used: File and storage sizes, memory capacity, and data quotas.
Petabytes vs Bytes
The petabyte and the byte 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 bytes are in a petabyte?
One petabyte equals 1e+15 bytes.
What is the formula to convert petabytes to bytes?
Multiply the number of petabytes by 1e+15. To reverse it, divide by 1e+15 instead.
How do I convert bytes back to petabytes?
Divide by 1e+15, which is the same as multiplying by 1e-15.
How many bytes are in 10 petabytes?
10 PB works out to 1e+16 B.
How is the petabyte defined?
Exactly 1×10¹⁵ bytes under SI prefixes.