How Big is that File – in English?

Humans and computers sometimes just don’t get along. Take file sizes, for example. What a human being would call one gigabyte, a computer would call 1073741824 bytes. How do you translate one into the other? Pull up a chair.

The following handy function takes a number of bytes and translates it into a readable “human” string. Here’s the code:

Public Function ConvertBytes(ByVal Bytes As Long) As String
    ' Converts bytes into a readable "1.44 MB", etc. string
    If Bytes >= 1073741824 Then
        Return Format(Bytes / 1024 / 1024 / 1024, "#0.00") _
            & " GB"
    ElseIf Bytes >= 1048576 Then
        Return Format(Bytes / 1024 / 1024, "#0.00") & " MB"
    ElseIf Bytes >= 1024 Then
        Return Format(Bytes / 1024, "#0.00") & " KB"
    ElseIf Bytes > 0 And Bytes < 1024 Then
        Return Fix(Bytes) & " Bytes"
        Return "0 Bytes"
    End If
End Function

Here’s an example of the function in use. Here, the length of my file is 3027676 bytes—and the ConvertBytes function returns “2.89MB”. Perfect:

Dim objInfo As New System.IO.FileInfo("c:\myfile.bmp")
MessageBox.Show("File is " & ConvertBytes(objInfo.Length))

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Karl Moore


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