How many mebibytes are in a gigabyte?

1 GB (gigabyte, SI decimal) equals exactly 953.674316 MiB (mebibytes, IEC binary). This comes from dividing 1,000,000,000 bytes by 1,048,576 bytes per MiB. If you start with 1 GiB (gibibyte) instead, you get exactly 1,024 MiB.

What is the difference between GB and GiB?

GB (gigabyte) is the SI decimal unit: 1 GB = 1,000,000,000 bytes (10^9). GiB (gibibyte) is the IEC binary unit: 1 GiB = 1,073,741,824 bytes (2^30). Storage manufacturers use GB; operating systems like Linux and Windows (in some contexts) use GiB while sometimes labeling them "GB," which causes the apparent size discrepancy.

Why is 1 GB less than 1,024 MiB?

1 GB = 1,000,000,000 bytes. 1 MiB = 1,048,576 bytes. Dividing: 1,000,000,000 / 1,048,576 ≈ 953.674 MiB. Since 1 GiB = 1,024 MiB and 1 GiB > 1 GB, a single gigabyte contains fewer mebibytes than 1,024.

How do I convert gigabytes to mebibytes manually?

Multiply the gigabyte count by 1,000,000,000 to get bytes, then divide by 1,048,576. Equivalently, multiply GB × (1,000,000,000 / 1,048,576) ≈ multiply GB × 953.674316.

When would I need GB-to-MiB conversion?

Common cases include comparing hard drive or SSD capacity (rated in GB) to what your OS shows (in MiB or GiB), sizing memory buffers in software that uses MiB, and interpreting firmware memory maps that express sizes in MiB.

Gigabytes to Mebibytes Converter

Name: Gigabytes to Mebibytes Converter
Availability: InStock
Author: Nham Vu

Enter a gigabyte value and instantly get mebibytes (MiB, binary IEC) plus megabytes (MB, decimal SI), with a quick-reference table.

Input — Gigabytes (GB)

Number of gigabytes

Key ratio: 1 GB (SI decimal) = 953.674316 MiB (IEC binary). 1 GiB (gibibyte) = 1,024 MiB exactly. Storage specs use GB; OS tools often report in MiB/GiB.

Results

Enter a gigabyte value and click Convert.

Reference Table — Common Gigabyte Counts

Quick lookup for typical file and storage sizes.

Gigabytes (GB)	MiB (binary, IEC)	MB (decimal, SI)	Typical example

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Summary

Enter a gigabyte value and instantly get mebibytes (MiB, binary IEC) plus megabytes (MB, decimal SI), with a quick-reference table.

How it works

Enter the number of gigabytes in the input field.
The tool multiplies by 1,000,000,000 to get bytes, then divides by 1,048,576 to get mebibytes (MiB).
It also multiplies the gigabyte value by 1,000 to show the SI megabyte (MB) equivalent.
Results appear instantly with up to 10 significant digits.
Use the copy buttons to grab any result value.
Scroll down for a reference table covering common gigabyte counts.

Use cases

Check how many mebibytes a storage size in gigabytes maps to under the IEC binary standard.
Understand the difference between advertised GB capacity and OS-reported MiB values.
Convert RAM specifications from GB to MiB for precise memory allocation calculations.
Translate file sizes from gigabytes to mebibytes when working with binary-based tools.
Verify storage estimates when cloud pricing bills per GB but OS reports in MiB.
Cross-reference firmware or BIOS memory figures expressed in MiB against drive specs in GB.

Frequently Asked Questions

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