a fairly good chart right here.I like that it gives you a range. There really is a whole 15 cm of personal preference you have to factor in. For the most part though, the faster your're going, and the bigger the hits your going to do, the longer the ski you want to have under you.
Ski Size Chart
height in feet-inches
height in centimeters
suggested ski lengths
4'4"
132
115-130
4'6"
137
125-140
4'8"
142
130-145
4'10"
147
135-150
5'0"
152
135-155
5'2"
158
145-165
5'4"
163
150-170
5'6"
168
155-175
5'8"
173
160-180
5'10"
178
165-185
6'0"
183
170-190
6'2"
188
175-195
6'4"
193
180-200