ROUNDDOWN Function of Excel

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

Syntax:

ROUNDDOWN(Number, num_digits)

Number: Required,  Any 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

On Error GoTo ROUNDDOWN_Err
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

ROUNDDOWN_Exit:
Exit Function

ROUNDDOWN_Err:
MsgBox Err & " : " & Err.Description, , "ROUNDDOWN()"
Resume ROUNDDOWN_Exit
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.

Formula	Description	Result
=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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