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MS Excel: FORECAST Function (WS)

Learn how to use the Excel FORECAST function with syntax and examples.


The Microsoft Excel FORECAST function returns a prediction of a future value based on existing values provided.


The syntax for the Microsoft Excel FORECAST function is:

FORECAST( x-value, known_y_values, known_x_values )

Parameters or Arguments

x-value is the x-value used to predict the y-value.

known_y_values is the known y-values used to predict the y-value.

known_x_values is the known x-values used to predict the y-value.


  • If x-value is not a numeric value, the FORECAST function will return the #VALUE! error.
  • If known_y_values and known_x_values contain different numbers of elements, the FORECAST function will return the #N/A error.

Applies To

The FORECAST function can be used in the following versions of Microsoft Excel:

  • Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

Type of Excel Function

The FORECAST function can be used in Microsoft Excel as the following type of function:

  • Worksheet function (WS)

Example (as Worksheet Function)

Let's look at some Excel FORECAST function examples and explore how to use the FORECAST function as a worksheet function in Microsoft Excel:

Microsoft Excel

Based on the spreadsheet above, the following Excel FORECAST examples would return:

=FORECAST(5, B2:B6, A2:A6) would return 20.03269866
=FORECAST(10, B2:B6, A2:A6) would return 11.8937852
=FORECAST(8, {1,2,3}, {4,5,6}) would return 5
=FORECAST(7, {5.8, -1}, {2, -5}) would return 10.65714286
=FORECAST(50, {-1,-2,-3,-4}, {10,20,30,40}) would return -5