How many gigabytes are in a gibibyte?

Exactly 1.073741824 GB. One gibibyte equals 2^30 bytes (1,073,741,824 bytes), while one gigabyte equals 10^9 bytes (1,000,000,000 bytes). So 1 GiB = 1,073,741,824 ÷ 1,000,000,000 = 1.073741824 GB.

Why do hard drives use GB while operating systems often show GiB?

Hard drive manufacturers label capacity using SI gigabytes (10^9 bytes) because it yields a larger number. Operating systems historically use binary arithmetic (powers of 2) for memory addressing, so they display storage in gibibytes. A 500 GB drive therefore shows as roughly 465 GiB in Windows or Linux.

Is GiB always larger than GB for the same number?

Yes. Because 1 GiB = 1.073741824 GB, any positive number of gibibytes represents more bytes than the same number of gigabytes. For example, 8 GiB = 8.590 GB, meaning 8 GiB holds about 590 MB more data than 8 GB.

What is the percentage difference between GiB and GB?

A gibibyte is approximately 7.37% larger than a gigabyte. This comes from (1,073,741,824 − 1,000,000,000) / 1,000,000,000 × 100 ≈ 7.37%. The gap grows noticeably at tebibyte/terabyte scale (about 9.95% for TiB vs TB).

When should I use GiB versus GB?

Use GiB when working with RAM, CPU caches, OS memory allocations, or any context where binary (power-of-2) counting matters. Use GB for network transfer rates, storage capacities advertised by manufacturers, and cloud pricing — where the SI decimal standard is conventional.

Gibibytes to Gigabytes Converter

Enter a value in gibibytes (GiB) and instantly see the equivalent in gigabytes (GB), with the exact conversion formula shown.

Gibibytes Input

Amount (GiB)

Quick values

Binary (GiB): 1 GiB = 2³⁰ bytes = 1,073,741,824 bytes
Decimal (GB): 1 GB = 10⁹ bytes = 1,000,000,000 bytes

Gigabytes (GB)

—

Enter a value to see the calculation.

Bytes (exact)

—

1 GiB = 1,073,741,824 bytes

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Summary

A gibibyte (GiB) is a binary unit defined by the IEC standard as exactly 2^30 bytes (1,073,741,824 bytes). A gigabyte (GB) uses the SI decimal standard of exactly 10^9 bytes (1,000,000,000 bytes). Because of this 7.37% difference, the same amount of data appears larger when measured in GB than in GiB. This converter shows both the GB decimal result and the percentage difference so you can see exactly how the two standards diverge for any given input.

How it works

Enter the number of gibibytes (GiB) in the input field.
The tool multiplies your value by 1,073,741,824 to get the exact byte count.
It then divides by 1,000,000,000 to convert bytes to decimal gigabytes (GB).
Both the GB result and the byte count are shown instantly.
A comparison row highlights the percentage difference between GiB and GB.
Click Copy next to any result to copy the raw number to your clipboard.

Use cases

Understand why a 16 GiB RAM stick shows as 17.18 GB when calculated in decimal.
Compare OS-reported storage sizes (GiB) with drive manufacturer specs (GB).
Convert memory allocation figures from gibibytes to gigabytes for reporting.
Cross-check cloud storage pricing tiers that use SI GB against OS file sizes.
Calculate the exact byte count for a given GiB value in low-level programming.
Explain the GiB vs GB difference to teammates or stakeholders.

Frequently Asked Questions

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