Decimal.Multiply() Method in C#

The Decimal.Multiply() method in C# is used to multiply two specified decimal values and returns the result as a decimal. This method provides a safe way to perform decimal multiplication while maintaining precision and handling potential overflow conditions.

Syntax

Following is the syntax −

public static decimal Multiply(decimal val1, decimal val2);

Parameters

• val1 − The first decimal value (multiplicand).

• val2 − The second decimal value (multiplier).

Return Value

Returns a decimal value that represents the product of val1 and val2.

Using Decimal.Multiply() for Basic Multiplication

Example

using System;

public class Demo {
    public static void Main() {
        decimal val1 = 3.45m;
        decimal val2 = 2.35m;
        Console.WriteLine("Decimal 1 = " + val1);
        Console.WriteLine("Decimal 2 = " + val2);
        decimal res = Decimal.Multiply(val1, val2);
        Console.WriteLine("Result (Multiplication) = " + res);
    }
}

The output of the above code is −

Decimal 1 = 3.45
Decimal 2 = 2.35
Result (Multiplication) = 8.1075

Using Decimal.Multiply() with Extreme Values

When multiplying very large decimal values, an OverflowException is thrown if the result exceeds the range of the decimal type −

Example

using System;

public class Demo {
    public static void Main() {
        try {
            decimal val1 = Decimal.MaxValue;
            decimal val2 = 2.0m;
            Console.WriteLine("Decimal 1 = " + val1);
            Console.WriteLine("Decimal 2 = " + val2);
            decimal res = Decimal.Multiply(val1, val2);
            Console.WriteLine("Result (Multiplication) = " + res);
        }
        catch (OverflowException ex) {
            Console.WriteLine("OverflowException: " + ex.Message);
        }
    }
}

The output of the above code is −

Decimal 1 = 79228162514264337593543950335
Decimal 2 = 2.0
OverflowException: Value was either too large or too small for a Decimal.

Using Decimal.Multiply() with Different Scale Precision

Example

using System;

public class Demo {
    public static void Main() {
        decimal price = 19.99m;
        decimal quantity = 3.5m;
        decimal tax = 0.08m;
        
        decimal subtotal = Decimal.Multiply(price, quantity);
        decimal taxAmount = Decimal.Multiply(subtotal, tax);
        decimal total = Decimal.Add(subtotal, taxAmount);
        
        Console.WriteLine("Price per unit: " + price);
        Console.WriteLine("Quantity: " + quantity);
        Console.WriteLine("Subtotal: " + subtotal);
        Console.WriteLine("Tax (8%): " + taxAmount);
        Console.WriteLine("Total: " + total);
    }
}

The output of the above code is −

Price per unit: 19.99
Quantity: 3.5
Subtotal: 69.965
Tax (8%): 5.5972
Total: 75.5622

Comparison with Multiplication Operator

Conclusion

The Decimal.Multiply() method provides a reliable way to multiply decimal values while maintaining precision. It throws an OverflowException when the result exceeds the decimal range, making it safe for financial calculations where accuracy is critical.