Decimal.Round Method (Decimal, Int32, MidpointRounding)

Note: This method is new in the .NET Framework version 2.0.

Rounds a decimal value to a specified precision. A parameter specifies how to round the value if it is midway between two other numbers.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Public Shared Function Round ( _
	d As Decimal, _
	decimals As Integer, _
	mode As MidpointRounding _
) As Decimal
Dim d As Decimal
Dim decimals As Integer
Dim mode As MidpointRounding
Dim returnValue As Decimal

returnValue = Decimal.Round(d, decimals, mode)
public static Decimal Round (
	Decimal d, 
	int decimals, 
	MidpointRounding mode
public static function Round (
	d : decimal, 
	decimals : int, 
	mode : MidpointRounding
) : decimal



A decimal number to round.


The number of significant decimal places (precision) in the return value.


A value that specifies how to round d if it is midway between two other numbers.

Return Value

The number that is nearest to the d parameter with a precision equal to the decimals parameter. If d is halfway between two numbers, one of which is even and the other odd, the mode parameter determines which of the two numbers is returned. If the precision of d is less than decimals, d is returned unchanged.

Exception typeCondition


decimals is less than 0 or greater than 28.


mode is not a System.MidpointRounding value.


The result is outside the range of a Decimal object.

The decimals parameter specifies the number of significant decimal places in the return value and ranges from 0 to 28. If decimals is zero, an integer is returned.

The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called rounding to nearest or banker's rounding. If decimals is zero, this kind of rounding is sometimes called rounding toward zero.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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