Convert km to miles

In this article, we will take a look at km to miles conversion with java program that takes number of kilometers to be converted as user input.

km to miles formula
The relation between km and miles is

which means that there are 1.60934 km in a mile.

So, to convert km to miles, we need to divide the number of kilometers to be converted by 1.60934.
Formula to convert km to miles will be

Java program
Below is a java program that reads the number of kilometers to convert to miles as user input using scanner class.
Then, it divides this value by 1.60934.

Finally, it formats the result to 4 decimal places.

Scanner scanner = new Scanner(System.in);
System.out.println("Enter distance in km");
// read km input
String kmDist = scanner.nextLine();
// convert km to miles
double mileDist = Double.parseDouble(kmDist)/1.60934;
NumberFormat format = new DecimalFormat("#.####");
System.out.println(kmDist + " km to miles is " + 
                   format.format(mileDist));
scanner.close();

Output is

Above program converts 5 km to miles.

Note that nextLine() reads user input as a string. So, we need to convert it to a double value using Double.parseDouble().

We can also use nextDouble() method of scanner to directly read a double value as shown below

Scanner scanner = new Scanner(System.in); 
System.out.println("Enter distance in km"); 
// read km input 
double kmDist = scanner.nextDouble(); 
// convert km to miles 
double mileDist = kmDist/1.60934; 
NumberFormat format = new DecimalFormat("#.####"); 
System.out.println(kmDist + " km to miles is " + 
                   format.format(mileDist)); 
scanner.close();

Output is

It successfully converts 10 km to miles.