I've now changed my ballistics program to also handle some metric measurements, according to the specs Andrew Leigh from South Africa gave me in post #22 of this thread.
He said to leave velocities in fps, but change yardage range to meters, inches to cm, Fahrenheit to Celsius, altitude to meters, and wind speed from mph to kph. I've done all that. Check it out.
You can still download the program using the link shown in the first post, or from a link on the new web page I built for this program, which is at
www.sanesoftware.com
Note that conversions will not be exact due to rounding in various parts of the calculations and due to inexact constants in the formulas. It shouldn't be more than about 1 percent however.