Syntax

FORECAST(x, data_y, data_x)

Arguments

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

  • x
  • data_y
  • data_x

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

Description from Google Docs Editors Help

“Calculates the expected y-value for a specified x based on a linear regression of a dataset.”

Google’s help article for FORECAST →

Source: Google Docs Editors Help, “Google Sheets function list” (support.google.com/docs/table/25273), record record 327 of 516, data fetched 28 September 2026. Data month: September 2026.