In 1 petabytes there are 1,000,000,000 megabytes. Meanwhile in 1 megabytes there are 1.00000e-9 petabytes. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Megabytes to Petabytes calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert petabytes (PB) to megabytes (MB), multiply by the correct conversion factor.
Examples
Tip: This PB to MB conversion uses the base-10 standard often used for storage and data size labels.
In base-10 (decimal), 1 petabyte (PB) equals 1,000,000,000 megabytes (MB). This uses powers of 10, which many storage makers use on labels.
In base-2 (binary), 1 pebibyte (PiB) equals 1,073,741,824 megabytes (MiB). People often say “petabyte” when they mean this binary amount, so it helps to confirm which system you need.
Decimal units use 1,000 steps:
Binary units use 1,024 steps and different names:
The numbers look close at first, but the gap grows fast at PB size.
For decimal conversion:
For binary conversion (pebibytes to mebibytes):
If your input says PB but your context is binary (like many operating system displays), confirm whether it should be PiB instead.
In decimal:
In binary (0.5 PiB to MiB):
In decimal:
In binary (2 PiB to MiB):
Some tools report storage in decimal units (PB, TB, GB, MB). Others report in binary units but may still show familiar labels. At large sizes like petabytes, a small unit choice changes the result by millions of megabytes.
A petabyte is 1,000,000,000 MB in decimal units. In binary units, the closest match is a pebibyte, which is 1,073,741,824 MiB. People mix these terms in casual use, so check the unit labels when accuracy matters.
MB usually means megabyte in decimal. In binary contexts, you may see MiB (mebibyte). MB and MiB are not the same size, so mixing them can throw off results, especially when converting from PB.
For decimal PB to MB, move the decimal point 9 places to the right:
This quick method works only for decimal units.
PB to MB conversion helps when you need a smaller unit for:
Pick decimal or binary first, then convert. That one choice drives the final MB number.
The Calculate Box tool to convert petabytes to megabytes uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a petabytes value in the box and have it instantly converted to megabytes.