In 1 gigabytes there are 0.00000100000 petabytes. Meanwhile in 1 petabytes there are 1,000,000 gigabytes. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Petabytes to Gigabytes calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert gigabytes (GB) to petabytes (PB), start by picking the unit system. Storage makers often use decimal (base-10), while many computers show sizes in binary (base-2). Mixing them can make the number look “off”.
Use this when you mean standard storage units.
Use this when working with binary-prefixed units.
Tip: Write the unit as GB/PB for decimal, and GiB/PiB for binary. This keeps gigabytes to petabytes conversion clear and accurate.
In decimal units (base-10), 1 PB = 1,000,000 GB. This is the most common format used by storage makers and many cloud plans.
In binary units (base-2), 1 PiB (pebibyte) = 1,048,576 GiB (gibibytes). Some systems show sizes this way, even if they label them as “GB” and “PB.”
GB and PB are decimal units. They use powers of 10.
GiB and PiB are binary units. They use powers of 2.
The labels matter because the numbers don’t match.
Some tools report storage in decimal (GB, TB, PB). Others report in binary (GiB, TiB, PiB). The same drive can show a smaller number on a computer that uses binary units.
A “1 TB” drive often shows as about “931 GB” in many operating systems. That gap comes from decimal vs binary math, not missing space.
For decimal conversion, divide gigabytes by 1,000,000.
Example: 250,000 GB = 0.25 PB.
For decimal conversion, multiply petabytes by 1,000,000.
Example: 2.5 PB = 2,500,000 GB.
For binary conversion, divide GiB by 1,048,576.
Example: 1,048,576 GiB = 1 PiB.
Mixing decimal and binary units takes an extra step because PB and PiB are not the same size.
Useful reference points:
So:
No. 1 PB is smaller than 1 PiB.
In bytes, 1 PiB is about 12.59% larger than 1 PB.
In decimal units:
That also means:
A petabyte is huge. Here are rough, easy benchmarks (they vary by quality and format):
File sizes change a lot, so treat these as ballpark figures.
The prefixes mean the same scale, but the units differ.
8 bits = 1 byte, so:
Always check if you’re looking at “B” (bytes) or “b” (bits).
Stick to one system at a time: decimal (GB, TB, PB) or binary (GiB, TiB, PiB). Also watch the letter case.
Using decimal units (base-10):
The Calculate Box tool to convert gigabytes to petabytes uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a gigabytes value in the box and have it instantly converted to petabytes.