Petabytes to Megabits
Convert petabytes to megabits instantly — one petabyte is 8e+09 megabits.
| Petabytes | Megabits |
|---|---|
| 1 PB | 8000000000 Mb |
| 2 PB | 16000000000 Mb |
| 3 PB | 24000000000 Mb |
| 5 PB | 40000000000 Mb |
| 10 PB | 80000000000 Mb |
| 25 PB | 200000000000 Mb |
| 50 PB | 400000000000 Mb |
| 100 PB | 800000000000 Mb |
How to use
- Enter a value in the Petabytes field.
- The Megabits figure appears immediately — no button to press.
- Typing in the Megabits field converts back to Petabytes the same way.
- Use the reference table for the values that come up most often.
Petabytes to Megabits formula
The factor from petabytes to megabits is 8e+09.
Mb = PB × 8e+09
Why this factor: the petabyte and the megabit are both defined against the byte, so dividing one definition by the other gives 8e+09 directly. Both definitions are set out in full below.
To go the other way, divide by 8e+09 — or use the Megabits to Petabytes converter, which is the same calculation reversed.
Worked example
Start with 500 PB. Multiply by 8e+09 to get 4e+12 Mb.
500 PB × 8e+09 = 4e+12 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 megabit?
A megabit is one million bits — the unit internet speeds are advertised in.
Definition: Exactly 1,000,000 bits, so exactly 125,000 bytes.
Where it is used: Broadband speed tiers and video streaming bitrates, quoted as Mb/s or Mbps.
Worth knowing: Divide advertised megabits per second by 8 to get the megabytes per second a download will actually show.
Petabytes vs Megabits
The petabyte and the megabit 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 megabits are in a petabyte?
One petabyte equals 8e+09 megabits.
What is the formula to convert petabytes to megabits?
Multiply the number of petabytes by 8e+09. To reverse it, divide by 8e+09 instead.
How do I convert megabits back to petabytes?
Divide by 8e+09, which is the same as multiplying by 1.25e-10.
How many megabits are in 10 petabytes?
10 PB works out to 80000000000 Mb.
Is there anything to watch out for with megabits?
Divide advertised megabits per second by 8 to get the megabytes per second a download will actually show.
How is the petabyte defined?
Exactly 1×10¹⁵ bytes under SI prefixes.