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ROUNDDOWN Function of Excel

We have introduced ROUNDUP() Function of Excel in Microsoft Access earlier.  It works like ROUND() Function except that the number is always rounded up.  When number of digits is greater than 0 (zero), then the number is rounded up to the specified number of decimal places. If number of digits specified is 0 (zero), then the number is rounded up to the nearest integer.

Visit the following link for more details on Roundup() Function:

The ROUNDUP() Function of Excel in Access.

The ROUNDDOWN() Function of Excel does the opposite of ROUNDUP() Function.  When the number of digits specified is greater than 0 (zero) then the number is rounded down to the specified number of decimal Places.  If the number of digits specified is 0 (zero) then the number is rounded down to the nearest integer.


ROUNDDOWN(Number, num_digits)

Number: RequiredAny Real Number.

num_digits: Required, Number of Digits the Number to Round Down to.

Public Function ROUNDDOWN(ByVal Num As Double, ByVal num_digits As Integer) As Double
'ROUNDDOWN() Function of Excel Redefined in MS-Access
'Author: apr pillai
'Date  : Sept 2019
'Rights: All Rights Reserved by www.msaccesstips.com

Dim S1 As Integer, S2 As Integer

S1 = Sgn(Num)
S2 = Sgn(num_digits)

Select Case S1
    Case 0
        ROUNDDOWN = 0
        Exit Function
    Case 1
    Select Case S2
        Case 0
            ROUNDDOWN = Int(Num) * S1
        Case 1
            ROUNDDOWN = (Int(Num * (10 ^ num_digits)) / 10 ^ num_digits) * S1
        Case -1
            num_digits = Abs(num_digits)
            ROUNDDOWN = Int(Num / (10 ^ num_digits)) * 10 ^ (num_digits) * S1
    End Select
    Case -1
    Select Case S2
        Case 0
            ROUNDDOWN = Int(Abs(Num)) * S1
        Case 1
            ROUNDDOWN = (Int(Abs(Num) * (10 ^ num_digits)) / 10 ^ num_digits) * S1
        Case -1
            num_digits = Abs(num_digits)
            ROUNDDOWN = (Int(Abs(Num) / (10 ^ num_digits)) * 10 ^ num_digits) * S2
    End Select
End Select

Exit Function

MsgBox Err & " : " & Err.Description, , "ROUNDDOWN()"
End Function

The ROUNDDOWN() Function is not field tested for accuracy, use it at your own risk.

The Function is developed based on the sample output given in the Microsoft Help Document. The Microsoft Excel Help Document extract is reproduced below for your information.

=ROUNDDOWN(3.2, 0)Rounds 3.2 down to zero decimal places.3
=ROUNDDOWN(76.9,0)Rounds 76.9 down to zero decimal places.76
=ROUNDDOWN(3.14159, 3)Rounds 3.14159 down to three decimal places.3.141
=ROUNDDOWN(-3.14159, 1)Rounds -3.14159 down to one decimal place.3.1
=ROUNDDOWN(31415.92654, -2)Rounds 31415.92654 down to 2 decimal places to the left of the decimal point.31400
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