predicts a value along a linear trend · from excel · excel: verified match · sheets: verified match

signature

FORECAST(x, known_ys, known_xs)

returns: number

argument	required
x	required
known_ys	required
known_xs	required

examples

formula and result, taken from the engine's own test suite — every result below is asserted in CI, not written by hand.

errors

error values observed from the engine — each with a call that produces it.

error	produced by
#DIV/0!	=FORECAST(5, A1:A3, B1:B3)
#ERROR!	=FORECAST(1, 2)

related

• AVEDEV average of absolute deviations from the mean
• AVERAGE.WEIGHTED average of values weighted by a second range
• AVERAGEA averages values including text and logicals
• AVERAGEIF averages cells that match a condition
• AVERAGEIFS averages cells matching multiple conditions
• BETA.DIST beta distribution