Giga (símbolo G) [pronunciado /jiga/] es un prefijo del Sistema Internacional que indica un factor de 109 o 1 000 000 000 (mil millones). Proviene del griego γίγας, que significa «gigante». En informática, cuando se trata de comunicaciones se utiliza 1 000 000 000 (109), generalmente cuando se utiliza como prefijo de bit, para (gigabit o Gb). Sin embargo, en los sistemas de almacenamiento, un giga equivale a 1 073 741 824 (230), generalmente, como prefijo de byte, para (gigabyte o GB).

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Giga (/ˈdʒɪɡə/ or /ˈɡɪɡə/) is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 1000000000). It has the symbol G. Giga is derived from the Greek word γίγας, meaning "giant". The Oxford English Dictionary reports the earliest written use of giga in this sense to be in the Reports of the IUPAC 14th Conference in 1947: "The following prefixes to abbreviations for the names of units should be used: G giga 109×". When referring to information units in computing, such as gigabyte, giga may sometimes mean 1073741824 (230), although such use is inconsistent, contrary to standards and has been discouraged by the standards organizations. The inconsistency is that gigabit is never (or very rarely) used with the binary interpretation of the prefix, while gigabyte is sometimes used this way. The binary prefix gibi has been adopted for 230, while reserving giga exclusively for the metric definition.

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