Syntax

GAMMAINV(probability, alpha, beta)

Arguments

The printed syntax lists 3 argument(s), in order:

  • probability
  • alpha
  • beta

“optional” marks an argument Google prints in square brackets; “repeatable” marks one Google prints with “…”.

Description from Google Docs Editors Help

Google’s list says: See GAMMA.INV
That is Google’s whole one-line description for this function; the list points to GAMMA.INV, which has its own page on this site.

Google’s help article for GAMMAINV →

Source: Google Docs Editors Help, “Google Sheets function list” (support.google.com/docs/table/25273), record record 334 of 516, data fetched 28 September 2026. Data month: September 2026.