Math.Round Method (Decimal)

Rounds a decimal value to the nearest integer.

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

public static decimal Round (
	decimal d
public static Decimal Round (
	Decimal d
public static function Round (
	d : decimal
) : decimal
Not applicable.



A decimal number to be rounded.

Return Value

The integer nearest parameter d. If the fractional component of d is halfway between two integers, one of which is even and the other odd, then the even number is returned.

Exception typeCondition


The result is outside the range of a Decimal.

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. It minimizes rounding errors that result from consistently rounding a midpoint value in a single direction.

To control the type of rounding used by the Round(Decimal) method, call the Math.Round(Decimal,MidpointRounding) overload.

The following example demonstrates rounding to nearest.

Math.Round(4.4); //Returns 4.0.
Math.Round(4.5); //Returns 4.0.
Math.Round(4.6); //Returns 5.0.

System.Math.Round(4.4); //Returns 4.0.
System.Math.Round(4.5); //Returns 4.0.
System.Math.Round(4.6); //Returns 5.0.

System.Math.Round(4.4) //Returns 4.0.
System.Math.Round(4.5) //Returns 4.0.
System.Math.Round(4.6) //Returns 5.0.

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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