How to Convert Decimal to Double in C#

This tutorial will teach us how to convert decimal numbers to double in the C# language.

Use the Decimal.ToDouble() Method to Convert Decimal to Double in C#

The value of the provided decimal is converted into the equivalent double-precision floating-point number using Decimal.ToDouble(). Because a double-precision floating-point integer contains fewer significant digits than a decimal, this method has the potential to cause round-off mistakes.

It converts a specified decimal value to a double-precision, floating-point number using the Decimal.ToDouble() method.

Syntax:

public static double ToDouble(decimal deci);

• deci is the value in decimal notation that we want to convert to a double.
• This method will return a number with double precision and a floating point format that is the same as the expression dec.

Let’s look at an example for us to understand.

1. To begin, we have to use the following libraries.

   using System;
   using System.Collections.Generic;
   using System.IO;
   using System.Linq;
   

2. Within the Main() class, we will construct four decimal variables and initialize them with some values.

   decimal val1 = 9542.4m;
   decimal val2 = -23245.11m;
   decimal val3 = 10.888m;
   decimal val4 = 11111.4m;
   

3. Let’s use the Decimal.ToDouble() method on the decimal numbers and store the results on various double variables, val1converted, val2converted, val3converted and val4converted.

   double val1converted = Decimal.ToDouble(val1);
   double val2converted = Decimal.ToDouble(val2);
   double val3converted = Decimal.ToDouble(val3);
   double val4converted = Decimal.ToDouble(val4);
   

4. Lastly, we will output the resulting double values to the console.

   Console.WriteLine(val1converted);
   Console.WriteLine(val2converted);
   Console.WriteLine(val3converted);
   Console.WriteLine(val4converted);
   

Complete Source Code:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class decimal2doublebyZeeshan {
  static void Main() {
    decimal val1 = 9542.4m;
    decimal val2 = -23245.11m;
    decimal val3 = 10.888m;
    decimal val4 = 11111.4m;

    double val1converted = Decimal.ToDouble(val1);
    double val2converted = Decimal.ToDouble(val2);
    double val3converted = Decimal.ToDouble(val3);
    double val4converted = Decimal.ToDouble(val4);

    Console.WriteLine(val1converted);
    Console.WriteLine(val2converted);
    Console.WriteLine(val3converted);
    Console.WriteLine(val4converted);
  }
}

Output:

9542.4
-23245.11
10.888
11111.4