How many gibibytes are in a petabyte?

Using the SI decimal standard: 1 PB = 10^15 bytes, and 1 GiB = 2^30 bytes, so 1 PB ≈ 931,322.5746 GiB. Using the IEC binary standard: 1 PiB = 2^50 bytes = 1,048,576 GiB exactly.

What is the difference between GiB and GB?

GiB (gibibyte) is a binary unit equal to 2^30 = 1,073,741,824 bytes. GB (gigabyte) is a decimal unit equal to 10^9 = 1,000,000,000 bytes. 1 GiB is about 7.37% larger than 1 GB. Operating systems historically report sizes in GiB but label them "GB," causing confusion with hardware specs.

What is the difference between PB and PiB?

PB (petabyte) follows the SI decimal system: 1 PB = 10^15 = 1,000,000,000,000,000 bytes. PiB (pebibyte) follows the IEC binary system: 1 PiB = 2^50 = 1,125,899,906,842,624 bytes. 1 PiB is about 12.6% larger than 1 PB.

How do I convert gibibytes to petabytes manually?

Multiply the GiB value by 1,073,741,824 (bytes per GiB) then divide by 1,000,000,000,000,000 (bytes per PB). Simplified: PB = GiB × 1.073741824 × 10⁻⁶. For pebibytes: PiB = GiB ÷ 1,048,576.

Why does my OS show a different size than my storage vendor?

Storage vendors rate capacity in SI petabytes (powers of 1,000), while operating systems report sizes in binary units like GiB and PiB (powers of 1,024) — often mislabeling them "GB" or "PB." The result is that the same byte count always appears as a smaller number in binary units, creating the apparent discrepancy.

Gibibytes to Petabytes Converter

Name: Gibibytes to Petabytes Converter
Availability: InStock
Author: Nham Vu

Enter a gibibyte value and instantly get petabytes (PB, SI decimal) and pebibytes (PiB, IEC binary), plus a quick-reference table.

Input — Gibibytes (GiB)

Number of gibibytes

SI vs. binary: 1 GiB = 2³⁰ bytes; 1 PB (SI) = 10¹⁵ bytes, so 1 PB ≈ 931,322.57 GiB. 1 PiB (binary) = 1,048,576 GiB exactly.

Results

Enter a gibibyte value and click Convert.

Reference Table — Common GiB Counts

Quick lookup for typical memory and storage sizes in gibibytes.

Gibibytes (GiB)	PB (SI)	PiB (binary)	Typical example

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Summary

Enter a gibibyte value and instantly get petabytes (PB, SI decimal) and pebibytes (PiB, IEC binary), plus a quick-reference table.

How it works

Enter the number of gibibytes in the input field.
The tool multiplies by 2^30 (1,073,741,824 bytes per GiB) then divides by 10^15 to get decimal petabytes (PB, SI).
It also divides by 1,048,576 (2^20) to get binary pebibytes (PiB, IEC) — a purely binary step.
Related SI units (terabytes, megabytes) are shown for context.
Results appear instantly with up to 10 significant digits.
Use the copy buttons to grab any result value.

Use cases

Calculate how many petabytes a memory or storage figure reported in GiB actually represents.
Compare OS-reported sizes in GiB against cloud storage bills denominated in PB.
Plan petabyte-scale data center capacity starting from per-node GiB figures.
Convert backup and archive sizes from GiB to PB for executive or procurement reports.
Verify storage estimates when migrating large data sets between environments.
Understand the binary-to-decimal gap when purchasing hardware rated in PB but formatted in GiB.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu