FORECAST

Calculates a future Y value for a given X value based on existing values.

Syntax

=FORECAST(X, KnownYs, KnownXs)

Arguments

Name	Description
X	Number for which a value should be predicted. Passing non numeric values results in #VALUE! error.
KnownYs	A cell range which defines the dependent y numbers. No number values are ignored.
KnownXs	A cell range which defines the dependent x numbers. No number values are ignored.

Return

A number representing the predicted Y value for given X value.

Examples

Formula	Result	Comment
=FORECAST(30,A2:A6,B2:B6)	10.607253'	with cell values A2: 6, A3: 7, A4: 9, A5: 15, A6: 21 and B2: 20, B3: 28, B4: 31, B5: 38, B6: 40
=FORECAST(30,A7:A12,B2:B6)	#NA!	no y values