This program calculates values only in U.S. measurements at this time.
When you click on the above file link, the source code should show up in your browser. Go up in the browser under FILE, then go to SAVE AS. When you do this, a box comes up that asks you where you want to save the file on your system. Give it the path name you want and it will save it.
You will then have to compile the code on your machine to get an executable version.