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Giga (G)

The SI prefix giga (G): a factor of 10⁹, which is one billion (10⁹).

What is a giga unit?

Symbol
G
Quantity
SI Prefixes
Unit system
SI
Definition
The SI prefix giga (G): a factor of 10⁹, which is one billion (10⁹).
Exact
Yes, the value is exact by definition
Source
SI Brochure, 9th edition (BIPM, 2019)

Common applications

Used for gigabytes of memory, gigahertz processor clocks, gigawatts of power plant capacity and gigapascals of material strength.

Giga in other si prefixes units

Giga quick reference

Giga in other units
GigaTeraMegaBase unit (no prefix)
1 G= 0.001 T= 1000 M= 1000000000 ×1
10 G= 0.01 T= 10000 M= 10000000000 ×1
100 G= 0.1 T= 100000 M= 100000000000 ×1
1000 G= 1 T= 1000000 M= 1000000000000 ×1

Where the giga unit fits

The next smaller si prefixes unit is the mega unit (M). 1 G = 1000 M, and 1 M = 0.001 G.

The next larger si prefixes unit is the tera unit (T). 1 G = 0.001 T, and 1 T = 1000 G.

Frequently asked questions

How many tera units are in one giga unit?
One giga unit = 0.001 T (tera units).
How many mega units are in one giga unit?
One giga unit = 1000 M (mega units).
How many base units are in one giga unit?
One giga unit = 1000000000 ×1 (base units).