Gigabyte (GB)

A gigabyte is one billion bytes (10⁹) as used by drive makers, phone storage and data plans. Windows reports sizes in gibibytes (2³⁰ bytes) but labels them “GB”, so a 256 GB drive shows as about 238 GB.

Symbol: GB

Quantity: amount of digital information

SI relation: 1 GB = 8000000000 bit (exact)

Derivation: 1 GB = 10⁹ bytes = 8 × 10⁹ bits (decimal, SI).

Exact: yes, by definition

Typical uses

Phone and laptop storage
Mobile data plans
RAM sizes
Game and video downloads

Convert gigabytes to other units

1 GB in other data storage units
Conversion	1 GB equals	Reverse
gigabyte to byte	1000000000 B	byte to gigabyte
gigabyte to kilobyte	1000000 kB	kilobyte to gigabyte
gigabyte to megabyte	1000 MB	megabyte to gigabyte
gigabyte to terabyte	0.001 TB	terabyte to gigabyte
gigabyte to bit	8000000000 bit	bit to gigabyte
gigabyte to megabit	8000 Mbit	megabit to gigabyte
gigabyte to kibibyte	976562.5 KiB	kibibyte to gigabyte
gigabyte to mebibyte	953.6743164 MiB	mebibyte to gigabyte
gigabyte to gibibyte	0.9313225746 GiB	gibibyte to gigabyte
gigabyte to kilobit	8000000 kbit	kilobit to gigabyte
gigabyte to gigabit	8 Gbit	gigabit to gigabyte
gigabyte to petabyte	0.000001 PB	petabyte to gigabyte
gigabyte to tebibyte	0.0009094947018 TiB	tebibyte to gigabyte

Open the Data Storage Converter to convert any value between all units.

Sources

The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7 (SI prefixes); hertz, Table 4.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.

Cite this page

APA

Scientific Converters. (2026, October 15). Gigabyte (GB). Retrieved October 25, 2026, from https://scientificconverters.com/units/gigabyte/

IEEE

Scientific Converters, "Gigabyte (GB)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/gigabyte/