How Do I Round a Double to Two Decimal Places in Java?

When working with decimal numbers in Java, you often need to round a double value to two decimal places. This is especially common in financial applications, reports, pricing calculations, and user interfaces where long decimal values can be difficult to read.

In this tutorial, you’ll learn several ways to round a double to two decimal places in Java.

Why Round Decimal Numbers?

Consider the following value:

double number = 12.3456789;

Displaying all decimal digits may not be desirable. Instead, you may want:

12.35

Rounding makes numbers cleaner and easier to understand.

Method 1: Using Math.round()

One of the simplest methods is using Math.round().

double number = 12.3456;

double rounded = Math.round(number * 100.0) / 100.0;

System.out.println(rounded);

Output

12.35

How It Works

1. Multiply by 100
2. Round to the nearest whole number
3. Divide by 100

Example:

12.3456 × 100 = 1234.56

Math.round(1234.56) = 1235

1235 / 100 = 12.35

Method 2: Using String.format()

If you only need formatted output, use String.format().

double number = 12.3456;

String result = String.format("%.2f", number);

System.out.println(result);

Output

12.35

Benefits

• Easy to use
• Great for displaying values
• Common in reports and UI applications

Method 3: Using DecimalFormat

Java provides the DecimalFormat class for number formatting.

import java.text.DecimalFormat;

public class Main {
    public static void main(String[] args) {

        double number = 12.3456;

        DecimalFormat df = new DecimalFormat("#.##");

        System.out.println(df.format(number));
    }
}

Output

12.35

This method is useful when formatting many numbers consistently.

Method 4: Using BigDecimal

For financial calculations, BigDecimal is usually the best choice.

import java.math.BigDecimal;
import java.math.RoundingMode;

public class Main {

    public static void main(String[] args) {

        double number = 12.3456;

        BigDecimal bd =
            new BigDecimal(number);

        bd = bd.setScale(
            2,
            RoundingMode.HALF_UP
        );

        System.out.println(
            bd.doubleValue()
        );
    }
}

Output

12.35

Why Use BigDecimal?

• High precision
• Avoids floating-point errors
• Preferred for money-related applications

Comparing the Methods

Method	Returns	Best For
Math.round()	double	Quick rounding
String.format()	String	Displaying values
DecimalFormat	String	Formatted output
BigDecimal	Precise number	Financial calculations

Common Mistake

Many developers try:

double number = 12.3456;

System.out.println(number);

Output:

12.3456

This does not round the value.

You must explicitly apply formatting or rounding logic.

Example: Price Formatting

Suppose you’re displaying a product price:

double price = 199.999;

Using:

System.out.printf(
    "%.2f",
    price
);

Output:

200.00

This provides a cleaner user experience.

Best Practice

For most applications:

double rounded =
    Math.round(value * 100.0)
    / 100.0;

For financial systems:

BigDecimal

is generally the safest and most accurate choice.

Infographic

Conclusion

There are several ways to round a double to two decimal places in Java:

• Math.round() for quick calculations
• String.format() for displaying values
• DecimalFormat for formatting output
• BigDecimal for precise financial calculations

The best method depends on whether you need a rounded number for calculations or simply want to display it in a user-friendly format.

Happy Coding!