Excel FORECAST Function
This post will guide you how to use the FORECAST function with syntax and examples in Microsoft excel.
Table of Contents
Description
The Excel FORECAST function used to calculate or predict a future value by using existing values. You can use the FORECAST function to get the predicated yvalue for a given xvalue. So the known values are existing xvalues and yvalues, and then get the new predicted by using linear regression.
The FORECAST function has been replaced by the FORECAST.LINEAR function in Excel 2016.
For example, you can use this function to predict future sales trends.
The FORECAST function is a buildin function in Microsoft Excel and it is categorized as a Statistical Function.
The FORECAST function is available in Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000, Excel 2011 for Mac.
Syntax
The syntax of the FORECAST function is as below:
= FORECAST (x, known_y's, known_x's)
Where the FORECAST function arguments are:
 X This is a required argument. A numeric xvalue that used to predict the new yvalue.
 known_y’s This is a required argument. The known yvalues or range of data used to predict the new yvalue.
 known_x’s This is a required argument. The known xvalues or range of data used to predict the new yvalue.
Note:
 If X argument is nonnumeric, the FORECAST Function will return the #VALUE! Error value.
 If Known_y’s and known_x’s arguments are empty or contain a different array lengths, the FORECAST function will return #N/A Error. It means that the length of the known_y’s array must be same as the known_y’s length.
 If the variance of the known_x’s is equal to 0, the FORECAST function will return the #DIV/0! Error value.
 The FORECAST function try to calculate a new yvalue using the following equation:
Excel FORECAST Function Examples
The below examples will show you how to use Excel FORECAST Function to calculate a prediction of a future value based on existing values.
1# to predict a future value based on known xvalues A1:A3 and known yvalues B1:B3, using the following formula:
=FORECAST(C1,B1:B3,A1:A3)
Related Functions

Excel GROWTH Function
The Excel GROWTH function calculates the predicted exponential growth based on existing data. The syntax of the GROWTH function is as below:= GROWTH (known_y’s, [known_x’s], [new_x’s], [const])…
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