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GB to GiB Converter

Gigabytes (decimal) to gibibytes (binary), both directions — the conversion behind every "why does my drive look smaller?" moment.

Decimals:
3
GB

What drive boxes, spec sheets, and cloud plans mean: 10⁹ bytes.

GiB

What Windows, Steam, and RAM actually count: 2³⁰ bytes.

🪟 Windows will display this capacity as: 931.32 "GB"
Try a size:

Formula: GiB = GB × 10⁹ ÷ 2³⁰ = GB × 0.93132257 · reverse: GB = GiB × 1.07374182. Both fields are editable — type in either one.

The Formula, Worked Once by Hand

Both units count bytes; they disagree only on what "giga" multiplies. GB uses the metric ladder (×1,000 per step), GiB uses the binary ladder (×1,024 per step). Converting is one multiplication:

500 GB × 1,000,000,000 = 500,000,000,000 bytes

then divide by 1,073,741,824 (= 1,024³)

500,000,000,000 ÷ 1,073,741,824 = 465.661 GiB

That 465.66 is exactly what Windows prints (labeled "GB") for a 500 GB drive — the conversion and the "shrink" are the same arithmetic. The full story of why two systems exist, who uses which, and how the gap compounds from 2.4% at kilobyte scale to 12.6% at petabyte scale lives in our companion guide: GB vs GiB, explained properly.

Common GB to GiB Values

1 GB = 0.931 GiB

The base ratio itself

100 GB = 93.132 GiB

Cloud plan / partition math

256 GB = 238.419 GiB

Phone & base-model SSD class

500 GB = 465.661 GiB

Windows shows ~465.66 "GB"

1,000 GB = 931.323 GiB

The classic 1 TB drive readout

2,000 GB = 1,862.645 GiB

2 TB — Windows flips to "1.81 TB"

Going the other way, the reverse anchors worth memorizing: 1 GiB = 1.074 GB, 16 GiB (a typical RAM kit's true size) = 17.18 GB, and 1,024 GiB = 1 TiB = 1.0995 TB. For drive-scale numbers — where Windows switches to "TB" labels — the GB to TB converter shows the Windows readout for every common capacity.

Frequently Asked Questions

Quick answers on converting GB to GiB

How many GiB are in a GB?
1 GB = 0.93132 GiB. A gigabyte is 1,000,000,000 bytes while a gibibyte is 1,073,741,824 bytes (1,024³), so dividing the two gives 0.9313. Practical anchors: 100 GB = 93.13 GiB, 500 GB = 465.66 GiB, and 1,000 GB = 931.32 GiB — the famous "1 TB drive shows 931 GB" number.
What is the GB to GiB formula?
GiB = GB × 10⁹ ÷ 2³⁰, which simplifies to GiB = GB × 0.93132257. In reverse, GB = GiB × 1.07374182. Worked example: 250 GB × 0.93132 = 232.83 GiB. Every result on this page uses exactly this arithmetic — no rounding shortcuts until the final displayed decimals.
Is GiB bigger than GB?
Yes, by about 7.4%: one gibibyte holds 1,073,741,824 bytes against the gigabyte's even 1,000,000,000. Because the unit is bigger, the same data makes a smaller number in GiB — which is why capacities "shrink" when Windows reports them in binary units.
Why does Windows show fewer GB than the drive box says?
Windows computes storage by dividing bytes by 1,024³ — producing gibibytes — but prints the result with a "GB" label. A 1 TB drive (1,000,000,000,000 bytes, all present) becomes 1,000,000,000,000 ÷ 1,073,741,824 = 931.32, displayed as "931 GB." It is a unit conversion, not missing space. Our GB vs GiB guide walks through the whole story.
Is 1 GiB equal to 1,024 MB?
Not quite — mixed units make it messy. 1 GiB = 1,024 MiB exactly (binary throughout), and 1 GiB = 1,073.74 MB (converting to decimal megabytes). The clean statements are: 1 GiB = 1,024 MiB = 1,073,741,824 bytes, and 1 GB = 1,000 MB = 1,000,000,000 bytes. Pick one system and stay in it.

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