Metric Converter

import java.util.Scanner;

public class MetricConverter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double inputDistance = Double.parseDouble(scanner.nextLine());
        String inputUnit = scanner.nextLine();
        String outputUnits = scanner.nextLine();

        double milimetars = 1000;
        double cintimetars = 100;
        double milies = 0.000621371192;
        double inches = 39.3700787;
        double kilometars =  0.001;
        double feet =  3.2808399;
        double yards = 1.0936133;

        if (inputUnit.equals("cm")) {
            inputDistance = inputDistance / cintimetars;
        } else if (inputUnit.equals("mm")) {
            inputDistance = inputDistance / milimetars;
        } else if (inputUnit.equals("mi")) {
            inputDistance = inputDistance / milies;
        } else if (inputUnit.equals("in")) {
            inputDistance = inputDistance / inches;
            } else if (inputUnit.equals("km")) {
            inputDistance = inputDistance / kilometars;
            } else if (inputUnit.equals("ft")) {
            inputDistance = inputDistance / feet;
            } else if (inputUnit.equals("yd")) {
            inputDistance = inputDistance / yards;
            }

                if (outputUnits.equals("cm")) {
                    inputDistance = inputDistance * cintimetars;
                } else if (outputUnits.equals("mm")) {
                    inputDistance = inputDistance * milimetars;
                } else if (outputUnits.equals("mi")) {
                    inputDistance = inputDistance * milies;
                } else if (outputUnits.equals("in")) {
                    inputDistance = inputDistance * inches;
                } else if (outputUnits.equals("km")) {
                    inputDistance = inputDistance * kilometars;
                } else if (outputUnits.equals("ft")) {
                    inputDistance = inputDistance * feet;
                } else if (outputUnits.equals("yd")) {
                    inputDistance = inputDistance * yards;
                }

                System.out.printf("%f %s", inputDistance, outputUnits);
            }

        }