Using Microsoft Excel Worksheet Functions in Visual Basic [Excel 2003 VBA Language Reference]

You can use most Microsoft Excel worksheet functions in your Visual Basic statements. To see a list of the worksheet functions you can use, see List of Worksheet Functions Available to Visual Basic .

Note  Some worksheet functions aren't useful in Visual Basic. For example, the Concatenate function isn't needed because in Visual Basic you can use the & operator to join multiple text values.

Calling a Worksheet Function from Visual Basic

In Visual Basic, the Microsoft Excel worksheet functions are available through the WorksheetFunction object.

The following Sub procedure uses the Min worksheet function to determine the smallest value in a range of cells. First, the variable myRange is declared as a Range object, and then it's set to range A1:C10 on Sheet1. Another variable, answer, is assigned the result of applying the Min function to myRange. Finally, the value of answer is displayed in a message box.

Sub UseFunction()
    Dim myRange As Range
    Set myRange = Worksheets("Sheet1").Range("A1:C10")
    answer = Application.WorksheetFunction.Min(myRange)
    MsgBox answer
End Sub

If you use a worksheet function that requires a range reference as an argument, you must specify a Range object. For example, you can use the Match worksheet function to search a range of cells. In a worksheet cell, you would enter a formula such as =MATCH(9,A1:A10,0). However, in a Visual Basic procedure, you would specify a Range object to get the same result.

Sub FindFirst()
    myVar = Application.WorksheetFunction _
        .Match(9, Worksheets(1).Range("A1:A10"), 0)
    MsgBox myVar
End Sub

Note  Visual Basic functions don't use the WorksheetFunction qualifier. A function may have the same name as a Microsoft Excel function and yet work differently. For example, Application.WorksheetFunction.Log and Log will return different values.

Inserting a Worksheet Function into a Cell

To insert a worksheet function into a cell, you specify the function as the value of the Formula property of the corresponding Range object. In the following example, the RAND worksheet function (which generates a random number) is assigned to the Formula property of range A1:B3 on Sheet1 in the active workbook.

Sub InsertFormula()
    Worksheets("Sheet1").Range("A1:B3").Formula = "=RAND()"
End Sub


This example uses the worksheet function Pmt to calculate a home mortgage loan payment. Notice that this example uses the InputBox method instead of the InputBox function so that the method can perform type checking. The Static statements cause Visual Basic to retain the values of the three variables; these are displayed as default values the next time you run the program.

Static loanAmt
Static loanInt
Static loanTerm
loanAmt = Application.InputBox _
    (Prompt:="Loan amount (100,000 for example)", _
        Default:=loanAmt, Type:=1)
loanInt = Application.InputBox _
    (Prompt:="Annual interest rate (8.75 for example)", _
        Default:=loanInt, Type:=1)
loanTerm = Application.InputBox _
    (Prompt:="Term in years (30 for example)", _
        Default:=loanTerm, Type:=1)
payment = Application.WorksheetFunction _
    .Pmt(loanInt / 1200, loanTerm * 12, loanAmt)
MsgBox "Monthly payment is " & Format(payment, "Currency")