What is a gibibyte (GiB)?

A gibibyte is a unit of digital information defined by the IEC as 2³⁰ bytes = 1,073,741,824 bytes. The name combines "gibi" (binary prefix for 2³⁰) with "byte." It is the binary counterpart to the SI decimal gigabyte (1 GB = 10⁹ = 1,000,000,000 bytes).

How many bytes are in one gibibyte?

Exactly 1,073,741,824 bytes. That is 2 to the power of 30, or 1,024 mebibytes (MiB), or 1,024² kibibytes (KiB).

Why do GiB and GB differ?

GB follows the SI decimal system (powers of 1,000), while GiB follows the IEC binary system (powers of 1,024). 1 GiB is about 7.37% larger than 1 GB. Storage makers label drives in GB; operating systems report usage in GiB — that gap is why a "500 GB" drive appears as roughly 465 GiB in Windows or macOS.

How do I convert bytes to gibibytes?

Divide the byte count by 1,073,741,824. For example: 5,000,000,000 bytes ÷ 1,073,741,824 ≈ 4.657 GiB.

Is RAM measured in GiB or GB?

RAM is manufactured and advertised in powers of two, so RAM capacity aligns with GiB. An 8 GB RAM stick in marketing terms is actually 8 GiB = 8,589,934,592 bytes — here the "GB" label on the package is technically a GiB.

Bytes to Gibibytes Converter

Enter a byte count and get gibibytes (GiB) instantly — with the full calculation breakdown and a side-by-side comparison against decimal gigabytes (GB).

Input — Bytes

Number of bytes

Binary definition: 1 GiB = 2³⁰ = 1,073,741,824 bytes — the IEC standard used by operating systems to report file and disk sizes.

Results

Enter a byte value and click Convert.

Reference Table — Common Byte Counts in GiB

Typical file and storage sizes in binary gibibytes.

Bytes	GiB (÷2³⁰)	GB (÷10⁹)	Typical example

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Summary

This tool converts any byte value into gibibytes (GiB) using the IEC binary standard: 1 GiB = 2³⁰ = 1,073,741,824 bytes. Unlike the decimal gigabyte (GB = 10⁹ bytes) used by storage manufacturers, the gibibyte is what most operating systems actually use when they display file and disk sizes. The tool shows each step of the calculation and places the GiB result alongside the equivalent GB value so you can see the ~7.37% gap between the two standards.

How it works

Enter the number of bytes in the input field.
The tool divides by 1,073,741,824 (2³⁰) to get gibibytes (GiB).
The calculation steps panel shows the full formula with your values.
The comparison card shows the decimal gigabyte (GB) equivalent side by side.
Use the copy button to grab the GiB result.
Check the reference table for common byte counts in GiB.

Use cases

Find out why an OS reports less space than advertised by a storage manufacturer.
Convert API or log sizes from bytes to GiB for capacity planning.
Verify that a file size in bytes matches the GiB figure shown in your OS.
Cross-check disk quotas in bytes against GiB limits in cloud dashboards.
Understand the difference between GB and GiB when reading technical specs.
Quick-check RAM sizes: 8 GiB of RAM = 8,589,934,592 bytes.

Frequently Asked Questions

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