VBA Array Length / Size

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This tutorial will teach you how to get the length (size) of an Array in VBA.

Get Array Length

In order to get the length of an Array, you need to know the array’s start and end positions. You can do this with the VBA’s UBound and LBound Functions.

LBound and UBound Functions

This procedure demonstrates how to use the UBound and LBound Functions on a a single dimension array:

Sub UBoundLBound()
    Dim exArr(1 To 4) As String
    MsgBox UBound(exArr)
    MsgBox LBound(exArr)
End Sub

Subtracting the two will give you the array length (UBound – LBound +1).

Get Array Length Function

This function will calculate the size (length) of a single-dimensional Array:

Public Function GetArrLength(a As Variant) As Long
   If IsEmpty(a) Then
      GetArrLength = 0
      GetArrLength = UBound(a) - LBound(a) + 1
   End If
End Function

Get 2D Array Size

This function will calculate the number of positions in a two-dimensional array:

Sub testArrySize()
    Dim arr2D(1 To 4, 1 To 4) As Long
    MsgBox GetArrSize_2D(arr2D)

End Sub

Public Function GetArrSize_2D(a As Variant) As Long
   Dim x As Long, y As Long
   If IsEmpty(a) Then
      GetArrSize_2D = 0
      x = UBound(a, 1) - LBound(a, 1) + 1
      y = UBound(a, 2) - LBound(a, 2) + 1
      GetArrSize_2D = x * y
   End If
End Function