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Gibibyte to Gigabyte Converter

Enter a size in gibibytes to convert to gigabytes and bytes.

Result

17.1799 GB
17,179,869,184 B

How it is calculated

One gibibyte is a binary unit, 1 GiB = 2³⁰ = 1,073,741,824 bytes, and one gigabyte is a decimal unit, 1 GB = 10⁹ = 1,000,000,000 bytes. The tool first converts your figure to bytes, bytes = GiB × 1,073,741,824, and then to decimal gigabytes, GB = bytes ÷ 1,000,000,000. So the GB figure is always about 7.4 % higher than the GiB figure. Gigabytes are shown with four decimals and bytes as a whole number. Zero is allowed and gives 0; negative numbers and empty fields give no result. The conversion only goes from GiB to GB, so to go the other way you divide a GB figure by 1.073741824.

Worked example

A computer has 16 GiB of memory, and you want the figure in decimal units. Bytes: 16 × 1,073,741,824 = 17,179,869,184 B. Gigabytes: 17,179,869,184 ÷ 1,000,000,000 = 17.1799 GB. The same calculation explains drive sizes in reverse: a drive sold as 500 GB holds 500,000,000,000 bytes, which an operating system reporting in binary units shows as about 465.66 GiB, and entering 465.66 here gives back 499.9986 GB.

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Common mistakes

  • Treating GiB and GB as the same unit; at 16 units the difference is already more than 1 GB, and it grows with size.
  • Entering a decimal GB figure (from a drive label) in the GiB box; the tool multiplies by 1.0737, so the result would be too large.
  • Expecting the drive to "lose" storage: the capacity in bytes is unchanged, only the unit used to count it differs.
  • Confusing GiB with Gb (gigabits) or GBps; bits are one eighth of a byte and the tool does not convert them.
  • Rounding the byte count: the exact figure is shown as a whole number, which matters when comparing to a file system or partition size reported in bytes.

About this calculator

Storage sizes are measured in two incompatible systems: the binary (IEC) system, where a gibibyte (GiB) equals exactly 2³⁰ = 1,073,741,824 bytes, and the decimal (SI) system, where a gigabyte (GB) equals 10⁹ = 1,000,000,000 bytes. Because operating systems traditionally report binary values while manufacturers label products in decimal, converting GiB to GB multiplies by 1.073741824 — which is exactly why a “1 TB” drive shows up as roughly 931 GiB in your file explorer.

This calculator clears up that mismatch by converting a size in gibibytes to both its decimal gigabyte value and raw byte count, which is useful whenever you need to reconcile a drive's advertised capacity, a memory module spec sheet, or a cloud storage quota against what your OS actually reports.

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Comments (1)

  • Editorial team

    Different systems label the same thing differently: Windows prints GB but counts in binary, so it really means GiB, while macOS counts in decimal. That is why one drive can read as two different sizes on two computers. The gap also widens with larger prefixes, reaching about 10% between tebibytes and terabytes. Where did you spot the mismatch, a drive, a memory stick or a cloud plan?

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