GB to GiB Converter
Convert decimal gigabytes to binary gibibytes — the reason a 1 TB drive shows as 931 GB. Results update as you type; exact factors shown.
One gigabyte (10⁹) is 0.9313 gibibyte (2³⁰) — see the exact factor, not a rounded rule of thumb.
How the gb to gib converter works
Storage converts through the byte (8 bits). Drive makers and network speeds use decimal prefixes (1 GB = 10⁹ bytes); operating systems often report binary units (1 GiB = 2³⁰ = 1,073,741,824 bytes) — sometimes labelled "GB". The gap is 7.4% at the gigabyte and 10% at the terabyte.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common data conversions
| From | To | Units |
|---|---|---|
| 1 GB | 0.9313 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 2 GB | 1.8626 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 4 GB | 3.7253 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 8 GB | 7.4506 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 16 GB | 14.9012 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 32 GB | 29.8023 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 64 GB | 59.6046 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 128 GB | 119.2093 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 256 GB | 238.4186 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 500 GB | 465.6613 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 512 GB | 476.8372 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
| 1,000 GB | 931.3226 GiB | gigabyte (10⁹) to gibibyte (2³⁰) |
Units in this converter and their exact factors
| Unit | Symbol | One unit in bytes |
|---|---|---|
| bit | bit | 0.125 byte |
| byte | B | 1 byte |
| kilobyte (10³) | kB | 1,000 byte |
| megabyte (10⁶) | MB | 1,000,000 byte |
| gigabyte (10⁹) | GB | 1,000,000,000 byte |
| terabyte (10¹²) | TB | 1,000,000,000,000 byte |
| kibibyte (2¹⁰) | KiB | 1,024 byte |
| mebibyte (2²⁰) | MiB | 1,048,576 byte |
| gibibyte (2³⁰) | GiB | 1,073,741,824 byte |
| tebibyte (2⁴⁰) | TiB | 1,099,511,627,776 byte |
FAQFrequently asked questions about data conversion
What is the difference between GB and GiB?
A GB is 1,000,000,000 bytes; a GiB is 1,073,741,824. The gap is about 7%.
Why does my drive look smaller than advertised?
Because it is sold in decimal GB and displayed in binary GiB — a 1 TB drive really holds a trillion bytes, which is 931 GiB.
Which is correct?
Both. They are different units, and the IEC defined KiB, MiB and GiB in 1998 precisely to end the ambiguity.
Does RAM use the same convention?
No — memory is genuinely sold in binary units, so 16 GB of RAM is 16 GiB.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.