How many gibibytes are in a petabyte?

Using the IEC binary standard: 1 PiB (pebibyte) = 1,048,576 GiB (2^50 ÷ 2^30). Storage vendors typically advertise in SI petabytes (10^15 bytes), while OS tools display binary gibibytes, so 1 SI PB ≈ 931,322.6 GiB. This tool uses the 1 PiB = 1,048,576 GiB exact binary relationship.

What is the difference between GiB and GB?

1 GiB (gibibyte) = 2^30 = 1,073,741,824 bytes (IEC binary). 1 GB (gigabyte) = 10^9 = 1,000,000,000 bytes (SI decimal). 1 GiB is about 7.4% larger than 1 GB. Operating systems like Linux, macOS, and Windows (since Vista) use GiB for actual storage reporting.

What is the difference between PB and PiB?

PB (petabyte) follows the SI decimal system: 1 PB = 1,000 TB = 10^15 bytes. PiB (pebibyte) follows the IEC binary system: 1 PiB = 1,024 TiB = 2^50 bytes. 1 PiB is about 12.6% larger than 1 PB. This calculator uses the exact binary relationship (PiB → GiB = ×1,048,576).

Why does my operating system show fewer GiB than expected for a large drive?

Storage hardware is rated in SI petabytes (powers of 1,000). Operating systems report capacity in binary gibibytes (powers of 1,024). Since 1 GiB > 1 GB, the same byte count produces a smaller number in GiB, making a drive appear smaller than its marketed size.

How accurate is this converter for very large petabyte values?

The converter uses JavaScript 64-bit floating-point (IEEE 754 double precision), which handles integers exactly up to 2^53. For petabyte-scale inputs under ~9,000 PB, results are accurate to at least 15 significant digits — more than sufficient for practical storage calculations.

Petabytes to Gibibytes Converter

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

Enter a petabyte value and instantly get gibibytes (GiB, IEC binary), plus a reference table for common sizes.

Input — Petabytes

Number of petabytes

Binary (IEC) standard: 1 PiB (pebibyte) = 1,048,576 GiB (2⁵⁰ ÷ 2³⁰). Storage vendors advertise SI petabytes; OS tools report binary gibibytes.

Results

Enter a petabyte value and click Convert.

Reference Table — Common Petabyte Values

Quick lookup for typical large-scale storage sizes.

Petabytes (PB)	GiB (binary, ×1,048,576)	GB (SI, ×10⁶)	Typical example

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Summary

Enter a petabyte value and instantly get gibibytes (GiB, IEC binary), plus a reference table for common sizes.

How it works

Enter the number of petabytes in the input field.
The tool multiplies by 1,048,576 to get gibibytes (GiB, IEC binary standard).
It also multiplies by 1,000,000 to get the equivalent SI gigabytes (GB) for reference.
Results appear instantly with up to 10 significant digits.
Use the copy button to grab any result value.
Scroll down for a reference table of common petabyte counts in GiB and GB.

Use cases

Convert petabyte-scale dataset sizes into the gibibytes reported by OS tools.
Plan storage provisioning when specs are in petabytes but the system reports GiB.
Cross-check cloud storage quotes in petabytes against on-prem capacity in GiB.
Calculate how many gibibytes a data-lake or backup archive of several petabytes will consume.
Translate analytics pipeline storage requirements from PB to GiB for capacity planning.
Verify data-center rack storage totals when mixing petabyte and gibibyte specifications.

Frequently Asked Questions

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