GB to KB Converter
Convert gigabytes to kilobytes — one million kilobytes to the gigabyte, on the decimal definition. Results update as you type; exact factors shown.
One gigabyte (10⁹) is 1,000,000 kilobyte (10³) — see the exact factor, not a rounded rule of thumb.
How the gb to kb 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 |
|---|---|---|
| 0.001 GB | 1,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 0.01 GB | 10,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 0.1 GB | 100,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 0.25 GB | 250,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 0.5 GB | 500,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 1 GB | 1,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 2 GB | 2,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 4 GB | 4,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 8 GB | 8,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 16 GB | 16,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 32 GB | 32,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
| 64 GB | 64,000,000 kB | gigabyte (10⁹) to kilobyte (10³) |
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
How many KB in a GB?
1,000,000 on the decimal (SI) definition storage makers use. On the binary definition it is 1,048,576 KiB.
Which definition should I use?
Decimal for drive capacity and network transfer; binary for RAM and for what Windows reports.
What is 1 GB in KB?
One million KB.
Why does my drive show less than advertised?
Because the maker counts decimal gigabytes and Windows displays binary gibibytes — a 1 TB drive shows as about 931 GiB.
What is a kibibyte?
1,024 bytes, the binary unit, written KiB to distinguish it from the 1,000-byte kilobyte.
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.