Metric Converter

import java.util.Scanner;

public class MetricConverter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double convertNumber = Double.parseDouble(scanner.nextLine());
        String convertMetric = scanner.nextLine();
        String convertIn = scanner.nextLine();
        double mTocm = convertNumber * 100;
        double mTomm = convertNumber * 1000;
        double cmTomm = convertNumber * 10;
        double cmTom = convertNumber / 100;
        if (convertMetric.equals("m") && (convertIn.equals("cm"))) {
            System.out.printf("%.3f", mTocm);
        } else if (convertMetric.equals("m") && (convertIn.equals("mm"))) {
            System.out.printf("%.3f", mTomm);
        } else if (convertMetric.equals("cm") && (convertIn.equals("mm"))) {
            System.out.printf("%.3f", cmTomm);
        } else if (convertMetric.equals("mm") && (convertIn.equals("cm"))) {
            convertNumber = convertNumber / 10;
            System.out.printf("%.3f", convertNumber);
        } else if (convertMetric.equals("mm") && (convertIn.equals("m"))) {
            convertNumber = convertNumber / 1000;
            System.out.printf("%.3f", convertNumber);
        } else if (convertMetric.equals("cm") && (convertIn.equals("m"))) {
            System.out.printf("%.3f", cmTom);
        }
    }
}