The scale in the Editor is out of 250 (except for Avoid K, which only goes to 213), but you should really think of it as being out of 200. Ratings over 200 are for superhuman players, for players who need to have ratings higher than 100/100. This makes conversion easy- if you want a player to have, say, Power of 80/100, double it in the Editor (give him 160).
Contact cannot be inputted directly, and is actually a combination of three factors (BABIP, Avoid K and Power). Contact is directly related to expected batting average. The factors combine, at least in the stats projection in the Editor, as follows:
-Power gives a certain number of HRs per 550 ABs;
-Avoid K determines how many Ks a player will have per 550 ABs;
-If the batter doesn't K or HR, the ball is in play, and BABIP determines the percentage of balls in play which are hits (1Bs, 2Bs or 3Bs).
Things are a bit messy because the effect of BABIP depends on how many balls are in play. For a player who homers and strikes out a ton, BABIP will have much less of an effect than for a player with no power and who always makes contact.
The exact formulas are here (post 9):
http://www.ootpdevelopments.com/boar....php?p=2265495