How many bytes are in 1 petabyte (SI)?

In the SI decimal standard, 1 petabyte (PB) equals exactly 1,000,000,000,000,000 bytes — that is 10^15 bytes. This is the definition used by cloud storage providers and drive manufacturers.

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

In the IEC binary standard, 1 pebibyte (PiB) equals exactly 2^50 bytes = 1,125,899,906,842,624 bytes. This is about 12.59% larger than a decimal petabyte. Operating systems that use binary arithmetic (including 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 = 1,000,000,000,000,000 bytes. 1 PiB (pebibyte, IEC) = 2^50 = 1,125,899,906,842,624 bytes. A pebibyte is about 12.59% larger than a petabyte. Always check which standard a storage vendor or OS uses to avoid budget surprises at scale.

How many gigabytes are in 1 petabyte?

Using SI decimal units, 1 PB = 1,000,000 GB (gigabytes). Using IEC binary units, 1 PiB = 1,048,576 GiB (gibibytes). The shorthand "one million gigabytes" is the most common approximation.

Can JavaScript handle petabyte-scale numbers accurately?

JavaScript's Number type uses 64-bit floating point, which gives exact integers up to 2^53 (about 9 quadrillion). Since 1 PiB = 2^50, values in the low single-digit petabyte range remain exact. Beyond a few petabytes, small rounding errors may appear — the tool notes this when results exceed that threshold.

Bytes to Petabytes Converter

Enter a byte count and instantly see the petabyte (PB) and pebibyte (PiB) equivalents, plus all intermediate units from kilobytes to petabytes.

Enter Byte Value

Number of Bytes

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)

—

Gibibytes (GiB)

—

Tebibytes (TiB)

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Pebibytes (PiB)

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Data Center Scale Reference

Description	Bytes	PB (SI)	PiB (binary)

Click any row to load that value into the converter.

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Summary

Enter a byte count and instantly see the petabyte (PB) and pebibyte (PiB) equivalents, plus all intermediate units from kilobytes to petabytes.

How it works

Enter any number of bytes in the input field.
The converter divides by 10^15 for the SI petabyte (PB) result.
It divides by 2^50 (1,125,899,906,842,624) for the binary pebibyte (PiB) result.
All intermediate SI units (KB, MB, GB, TB, PB) and IEC units (KiB, MiB, GiB, TiB, PiB) are shown simultaneously.
Large numbers are formatted with commas for readability; very small results use scientific notation.
Click any row in the reference table to load that byte value into the converter.

Use cases

Verify whether a data warehouse or cloud storage bucket reaches petabyte scale.
Compare vendor storage quotas (SI PB) against OS-reported usage (binary PiB).
Estimate how many bytes a petabyte-scale backup or data lake occupies.
Convert genomics, video archive, or telemetry dataset sizes to petabytes.
Understand the gap between 1 PB (SI) and 1 PiB (IEC) when planning storage costs.
Quick reference for data center-scale capacity planning discussions.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu