Petabytes to Megabytes
An instant petabytes-to-megabytes converter, with the formula and a reference table below.
| Petabytes | Megabytes |
|---|---|
| 1 PB | 1000000000 MB |
| 2 PB | 2000000000 MB |
| 3 PB | 3000000000 MB |
| 5 PB | 5000000000 MB |
| 10 PB | 10000000000 MB |
| 25 PB | 25000000000 MB |
| 50 PB | 50000000000 MB |
| 100 PB | 100000000000 MB |
How to use
- Enter a value in the Petabytes field.
- The Megabytes figure appears immediately — no button to press.
- Typing in the Megabytes field converts back to Petabytes the same way.
- Use the reference table for the values that come up most often.
Petabytes to Megabytes formula
Converting petabytes to megabytes is a single multiplication by 1e+09.
MB = PB × 1e+09
Why this factor: the petabyte and the megabyte are both defined against the byte, so dividing one definition by the other gives 1e+09 directly. Both definitions are set out in full below.
To go the other way, divide by 1e+09 — or use the Megabytes to Petabytes converter, which is the same calculation reversed.
Worked example
Take 500 PB and multiply by the factor 1e+09: the result is 500000000000 MB.
500 PB × 1e+09 = 500000000000 MB
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 megabyte?
A megabyte is one million bytes, the familiar unit for photos, songs and app sizes.
Definition: Exactly 1,000,000 bytes under SI prefixes. The binary mebibyte (MiB) is 1,048,576 bytes.
Where it is used: Photo and audio file sizes, app downloads, and mobile data allowances.
Petabytes vs Megabytes
The petabyte and the megabyte 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 megabytes are in a petabyte?
One petabyte equals 1e+09 megabytes.
What is the formula to convert petabytes to megabytes?
Multiply the number of petabytes by 1e+09. To reverse it, divide by 1e+09 instead.
How do I convert megabytes back to petabytes?
Divide by 1e+09, which is the same as multiplying by 1e-09.
How many megabytes are in 10 petabytes?
10 PB works out to 10000000000 MB.
How is the petabyte defined?
Exactly 1×10¹⁵ bytes under SI prefixes.