I was trying to find some info on sizing my daughter's skis. Here's some interesting sizing advice from an article at ehow.com, January 2012:
I found the original article at Ski Post, and they write:
"For Traditional length classical skis (Your height in inches) x 2.6 + 15 inches = approximate ski length in cm."
There's still conversion and unit issues here. Better:
(Your height in inches) x 2.54 cm/in + 15 cm = approximate ski lenghth.
Or how about just: Your height + four to twelve inches?