Mine

import java.util.Scanner;

public class Expert {

	/**
	 * @author
	 */
	public static void main(String[] args) {
		// Expert Mode
		
		
		System.out.print("This program converts US customary units of length to metric units of length\n" +
				"Enter a length (number) and units inch/inches/feet/foot/mile/miles) to convert: ");
		
		//Scanner to grab double amount, num; then to grab imperial type, imperial
		
		Scanner input = new Scanner(System.in);
		double num = input.nextFloat();
	    String imperial = input.next();
		
		
	    // toConvert == converting to 
		System.out.print("Convert " + imperial + " to centimeters, meters, or kilometers?: ");
		String metric = input.next();
		
		// From inches
		double inchCentimeters = 2.54;  // ie inches to centimeters
		double inchMeters = 0.0254;  
		double inchKilometers = 2.54E-5;
		
		// From Feet
		double footCentimeters = 30.48;
		double footMeters = 0.3048;
		double footKilometers = 0.0003048;
		
		// From Miles
		double milesCentimeters = 160934.4;
		double milesMeters = 1609.344;
		double milesKilometers = 1.609344;
		
		
		// Inches Conversion
		if (imperial.equalsIgnoreCase("inches")) {
		      if (metric.equalsIgnoreCase("centimeters")) {
		    	  System.out.println(num + " inches is " + num * inchCentimeters + " centimeters");
		      } else if (metric.equalsIgnoreCase("meters")) {
		    	  System.out.println(num + " inches is " + num * inchMeters + " meters");
		      } else if (metric.equalsIgnoreCase("kilometers")) {
		    	  System.out.println(num + " inches is " + num * inchKilometers + " kilometers");
		      } else System.out.println("Please spell correctly and try again.");
		    }
		if (imperial.equalsIgnoreCase("inch")) {
			 if (metric.equalsIgnoreCase("centimeters")) {
		    	  System.out.println(num + " inch is " + num * inchCentimeters + " centimeters");
		      } else if (metric.equalsIgnoreCase("meters")) {
		    	  System.out.println(num + " inch is " + num * inchMeters + " meters");
		      } else if (metric.equalsIgnoreCase("kilometers")) {
		    	  System.out.println(num + " inch is " + num * inchKilometers + " kilometers");
		      } else System.out.println("Please spell correctly and try again.");
		}
		
		// Feet Conversion
		if (imperial.equalsIgnoreCase("feet")) {
			 if (metric.equalsIgnoreCase("Centimeters")) {
		    	  System.out.println(num + " feet is " + num * footCentimeters + " centimeters");
		      } else if (metric.equalsIgnoreCase("Meters")) {
		    	  System.out.println(num + " feet is " + num * footMeters + " meters");
		      } else if (metric.equalsIgnoreCase("Kilometers")) {
		    	  System.out.println(num + " feet is " + num * footKilometers + " kilometers");
		      } else System.out.println("Please spell correctly and try again.");
		    }
		if (imperial.equalsIgnoreCase("foot")) {
			if (metric.equalsIgnoreCase("Centimeters")) {
		    	  System.out.println(num + " foot is " + num * footCentimeters + " centimeters");
		      } else if (metric.equalsIgnoreCase("Meters")) {
		    	  System.out.println(num + " foot is " + num * footMeters + " meters");
		      } else if (metric.equalsIgnoreCase("Kilometers")) {
		    	  System.out.println(num + " foot is " + num * footKilometers + " kilometers");
		      } else System.out.println("Please spell correctly and try again.");
		}
		
		// Miles Conversion
		if (imperial.equalsIgnoreCase("miles")) {
			 if (metric.equalsIgnoreCase("Centimeters")) {
		    	  System.out.println(num + " miles is " + num * milesCentimeters + " centimeters");
		      } else if(metric.equalsIgnoreCase("Meters")) {
		    	  System.out.println(num + " miles is " + num * milesMeters + " meters");
		      } else if(metric.equalsIgnoreCase("Kilometers")) {
		    	  System.out.println(num + " miles is " + num * milesKilometers + " kilometers");
		      } else System.out.println("Please spell correctly and try again.");
		    }
		if (imperial.equalsIgnoreCase("mile")) {
			if (metric.equalsIgnoreCase("Centimeters")) {
		    	  System.out.println(num + " mile is " + num * milesCentimeters + " centimeters");
		      } else if(metric.equalsIgnoreCase("Meters")) {
		    	  System.out.println(num + " mile is " + num * milesMeters + " meters");
		      } else if(metric.equalsIgnoreCase("Kilometers")) {
		    	  System.out.println(num + " mile is " + num * milesKilometers + " kilometers");
		      } else System.out.println("Please spell correctly and try again.");
		}


	}

}