You need to take measurements or you need to know a distance that separates you from a objective but the items you have are not in the unit of measure you know or are used to. You have measurements in miles you want measurements in kilometers. You have measurements in feet and you want to have measurements in meters, you have measurements in inches and you want them in cm.
This application is for you.
You have 3 screens to enter your measurements, in Mile, in Foot or Inch.

Then 3 CONVERT buttons, allow you to perform conversions for each type of measurement.
The result appears in the upper right screen.
You can alternate conversions.