How to limit a decimal number?

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How to format a decimal

How can I limit my decimal number so I'll get only 3 digits after the point?

e.g  2.774

for display? or to lose precision even more than you do already with floating point...? — gbn, Jul 09 '10 at 12:28

Pranay Rana · Accepted Answer · 2010-07-19T17:03:13.457

64

Math.Round Method (Decimal, Int32)

Example:

Math.Round(3.44, 1); //Returns 3.4.

edited Jul 19 '10 at 17:03

answered Jul 09 '10 at 12:22

Pranay Rana

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Note that by default, C# uses "Banker's Rounding" which may not be what you want, so there is a method overload Math.Round(decimal, int, MidpointRounding) to let you specify exactly which rounding method to use. E.g. TSQL uses 'Away From Zero' rounding so may give a different value than default C# rounding. – Dr Herbie Jul 09 '10 at 12:38

Matthew Flaschen · Answer 2 · 2010-07-09T12:30:32.897

15

I'm assuming you really mean formatting it for output:

Console.WriteLine("{0:0.###}", value);

edited Jul 09 '10 at 12:30

answered Jul 09 '10 at 12:24

Matthew Flaschen

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You can also use a [format specifier](https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#the-fixed-point-f-format-specifier): `string result = 1.23456.ToString("F2", CultureInfo.InvariantCulture);` – Matthias Braun Nov 18 '19 at 20:16

score 8 · Answer 3 · edited May 28 '11 at 18:55

8

To get Decimal back use Math.Round with Second parameter specifying number of decimal points.

decimal d = 54.9700M;    
decimal f = (Math.Round(d, 2)); // 54.97

To Get String representation of number use .ToString() Specifiying Decimal Points as N3. Where 3 is the decimal points

decimal d = 54.9700M;    
string s = number.ToString("N3"); // "54.97"

edited May 28 '11 at 18:55

Pranay Rana

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answered Jul 09 '10 at 12:27

heads5150

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score 1 · Answer 4 · edited Jun 10 '11 at 11:35

1

Use Math.Round to round it to 3 decimal places.

edited Jun 10 '11 at 11:35

Pranay Rana

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answered Jul 09 '10 at 12:23

Donnie

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score 1 · Answer 5 · answered Jul 09 '10 at 12:23

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Limiting the precision of a floating point number is a SQL concept. Decimal in csharp only means that it will remember the precision assigned. You can round to three decimal places before assigning. IE, Math.Round().

answered Jul 09 '10 at 12:23

Tim Coker

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score 0 · Answer 6 · edited Jun 01 '11 at 20:34

Part of my answer is the response, another part is just a interesting point:

I often want to see the variable as a prop/field. So a create a extension method to solve my problem:

Tensao is just an Enum that have a value related.

    public static class TensaoExtensions {
        public static double TensaoNominal(this Tensao tensao) {
            return Math.Round((double.Parse(EnumMapper.Convert(typeof(Tensao),
                           tensao.ToString()))) * 1000 / Math.Sqrt(3), 3);
        }
    }

How to limit a decimal number?

6 Answers6

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