数値を英単語に変換するVBAスクリプト　e.g. JPY 123,456,789 -> ONE HUNDRED TWENTY THREE MILLION FOUR HUNDRED FIFTY SIX THOUSAND SEVEN HUNDRED EIGHTY NINE

SpellNumber.bas

Option Explicit
'Main Function
Function SpellNumber(ByVal MyNumber)
    Dim Dollars, Temp
    Dim Count
    ReDim Place(9) As String
    Place(2) = " THOUSAND "
    Place(3) = " MILLION "
    Place(4) = " BILLION "
    Place(5) = " TRILLION "
    ' String representation of amount.
    MyNumber = Trim(Str(MyNumber))
    Count = 1
    Do While MyNumber <> ""
        Temp = GetHundreds(Right(MyNumber, 3))
        If Temp <> "" Then Dollars = Temp & Place(Count) & Dollars
        If Len(MyNumber) > 3 Then
            MyNumber = Left(MyNumber, Len(MyNumber) - 3)
        Else
            MyNumber = ""
        End If
        Count = Count + 1
    Loop
    Select Case Dollars
        Case ""
            Dollars = "NO AMOUNT"
        Case "ONE"
            Dollars = "ONE"
         Case Else
            Dollars = Dollars
    End Select
    SpellNumber = Dollars
End Function
      
' Converts a number from 100-999 into text
Function GetHundreds(ByVal MyNumber)
    Dim Result As String
    If Val(MyNumber) = 0 Then Exit Function
    MyNumber = Right("000" & MyNumber, 3)
    ' Convert the hundreds place.
    If Mid(MyNumber, 1, 1) <> "0" Then
        Result = GetDigit(Mid(MyNumber, 1, 1)) & " HUNDRED "
    End If
    ' Convert the tens and ones place.
    If Mid(MyNumber, 2, 1) <> "0" Then
        Result = Result & GetTens(Mid(MyNumber, 2))
    Else
        Result = Result & GetDigit(Mid(MyNumber, 3))
    End If
    GetHundreds = Result
End Function
      
' Converts a number from 10 to 99 into text.
Function GetTens(TensText)
    Dim Result As String
    Result = ""           ' Null out the temporary function value.
    If Val(Left(TensText, 1)) = 1 Then   ' If value between 10-19...
        Select Case Val(TensText)
            Case 10: Result = "TEN"
            Case 11: Result = "ELEVEN"
            Case 12: Result = "TWELVE"
            Case 13: Result = "THIRTEEN"
            Case 14: Result = "FOURTEEN"
            Case 15: Result = "FIFTEEN"
            Case 16: Result = "SIXTEEN"
            Case 17: Result = "SEVENTEEN"
            Case 18: Result = "EIGHTEEN"
            Case 19: Result = "NINETEEN"
            Case Else
        End Select
    Else                                 ' If value between 20-99...
        Select Case Val(Left(TensText, 1))
            Case 2: Result = "TWENTY "
            Case 3: Result = "THIRTY "
            Case 4: Result = "FORTY "
            Case 5: Result = "FIFTY "
            Case 6: Result = "SIXTY "
            Case 7: Result = "SEVENTY "
            Case 8: Result = "EIGHTY "
            Case 9: Result = "NINETY "
            Case Else
        End Select
        Result = Result & GetDigit _
            (Right(TensText, 1))  ' Retrieve ones place.
    End If
    GetTens = Result
End Function
     
' Converts a number from 1 to 9 into text.
Function GetDigit(Digit)
    Select Case Val(Digit)
        Case 1: GetDigit = "ONE"
        Case 2: GetDigit = "TWO"
        Case 3: GetDigit = "THREE"
        Case 4: GetDigit = "FOUR"
        Case 5: GetDigit = "FIVE"
        Case 6: GetDigit = "SIX"
        Case 7: GetDigit = "SEVEN"
        Case 8: GetDigit = "EIGHT"
        Case 9: GetDigit = "NINE"
        Case Else: GetDigit = ""
    End Select
End Function

参考URL
https://support.office.com/en-us/article/Convert-numbers-into-words-a0d166fb-e1ea-4090-95c8-69442cd55d98?ui=en-US&rs=en-US&ad=US