GB and GiB differ by 7.4% at 1 GB and the gap grows with scale. A 1 TB drive contains 1000 GB by the manufacturer's count but only 931 GiB by the OS count. This converter handles the GB/GiB split across Windows, Linux, and macOS storage reporting.
Last updated: May 2026
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How to Convert GB to GIB
1 GB (gigabyte) = 1,000,000,000 bytes. 1 GiB (gibibyte) = 1,073,741,824 bytes. To convert GB to GiB, multiply by 0.9313 (or exactly 1000/1024). At 100 GB: 93.13 GiB. At 1000 GB: 931.3 GiB. The same binary vs decimal gap applies at smaller scale, so the MB to MiB converter handles megabyte comparisons.
Example: 100 GB × 0.9313 = 93.13 GiB
Conversion Table
GB
GIB
1 gb
0.9313 gib
2 gb
1.8626 gib
5 gb
4.6565 gib
10 gb
9.313 gib
20 gb
18.626 gib
50 gb
46.565 gib
100 gb
93.13 gib
250 gb
232.825 gib
500 gb
465.65 gib
1000 gb
931.3 gib
Frequently Asked Questions
My NAS shows 3.6 TiB available but I bought a 4 TB drive. Where did the space go?
Nothing is missing. Drive manufacturers count in decimal terabytes (1 TB = 1,000,000,000,000 bytes). File systems and OS tools report in binary tebibytes (1 TiB = 1,099,511,627,776 bytes). A 4 TB drive contains exactly 3.637 TiB of usable space. File system overhead and partition tables reduce it a little further, which is why NAS tools typically show 3.6 TiB for a 4 TB drive.
Does the GB vs GiB difference matter for cloud storage billing?
Yes. Cloud providers bill in decimal gigabytes. Backup software often reports in binary gibibytes. A 500 GB backup job (decimal) is about 466 GiB. If your backup tool shows 466 GiB completed and the cloud bill shows 500 GB used, both numbers are correct: they measure the same data in different units. Always confirm which convention your backup or storage software uses before comparing invoices to software reports.
Why does my OS show less storage than the drive label says?
Drive manufacturers use decimal gigabytes (1 GB = 1,000,000,000 bytes), while operating systems like Windows and Linux show binary gibibytes (1 GiB = 1,073,741,824 bytes). A 1 TB drive contains exactly 1,000 GB but only about 931 GiB, which is what Windows reports. No storage is missing; it is a unit labeling difference.
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