How many megabytes are in 1 petabyte (SI)?

In the SI decimal standard, 1 petabyte (PB) equals exactly 1,000,000,000 megabytes (10^9 MB). This is the definition used by cloud storage providers and hard drive manufacturers.

How many mebibytes are in 1 pebibyte (IEC binary)?

In the IEC binary standard, 1 pebibyte (PiB) equals exactly 2^30 mebibytes = 1,073,741,824 MiB. Operating systems using binary arithmetic (most Linux tools) work in pebibytes while sometimes labeling them "PB".

What is the difference between PB and PiB?

1 PB (petabyte, SI) = 10^15 bytes. 1 PiB (pebibyte, IEC) = 2^50 bytes = 1,125,899,906,842,624 bytes. A pebibyte is about 12.59% larger than a petabyte. When converting from megabytes, 1 PB = 10^9 MB while 1 PiB = 1,073,741,824 MiB.

How do I convert megabytes to petabytes?

Divide the megabyte value by 1,000,000,000 (10^9) to get SI petabytes. For binary pebibytes, divide the mebibyte value by 1,073,741,824 (2^30).

Can JavaScript handle petabyte-scale numbers accurately?

JavaScript's Number type uses 64-bit floating point, giving exact integers up to 2^53. Since 1 PiB = 2^50 bytes, values in the low single-digit petabyte range stay exact when working from megabytes. Beyond a few hundred petabytes' worth of MB, small rounding errors may appear.

Megabytes to Petabytes Converter

Enter a megabyte count and instantly see petabytes (PB, SI decimal) and pebibytes (PiB, IEC binary), plus all intermediate storage units.

Enter Megabyte Value

Number of Megabytes (MB)

Input unit

Results

Enter a value and click Convert to see results.

Bytes (B)

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SI Decimal (powers of 1,000)

Kilobytes (KB)

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Megabytes (MB)

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Gigabytes (GB)

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Terabytes (TB)

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Petabytes (PB)

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IEC Binary (powers of 1,024)

Kibibytes (KiB)

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Mebibytes (MiB)

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Gibibytes (GiB)

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Tebibytes (TiB)

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Pebibytes (PiB)

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Megabyte to Petabyte Reference

Description	Megabytes (MB)	PB (SI)	PiB (binary)

Click any row to load that value into the converter.

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Summary

This tool converts a megabyte value into petabytes and all intermediate units using both the SI decimal standard (1 PB = 10^9 MB = 1,000,000,000 MB) and the IEC binary standard (1 PiB = 2^30 MiB = 1,073,741,824 MiB). Petabyte-scale figures arise in data centers, genomic research, and cloud storage planning. The ~7.37% difference between PB and PiB matters when comparing vendor quotas against OS-reported disk usage.

How it works

Enter any number of megabytes in the input field.
The converter multiplies by 10^6 to get bytes, then divides by 10^15 for the SI petabyte (PB) result.
For binary, it multiplies by 2^20 to get bytes, then divides by 2^50 for the pebibyte (PiB) result.
All intermediate SI units (KB, MB, GB, TB, PB) and IEC units (KiB, MiB, GiB, TiB, PiB) appear simultaneously.
Large numbers are formatted with commas; very small results use scientific notation.
Click any row in the reference table to load that megabyte value into the converter.

Use cases

Estimate how many petabytes a data warehouse or backup archive represents.
Compare vendor storage quotas listed in MB against petabyte-scale planning numbers.
Convert genomics, video archive, or telemetry dataset sizes expressed in MB to petabytes.
Understand the difference between 1 PB (SI) and 1 PiB (IEC) for storage cost planning.
Quick reference for capacity planning when scaling from megabyte-level logs to petabyte storage.

Frequently Asked Questions

Last updated: 2026-06-19 · Reviewed by Nham Vu