In reply to alexrp:
Best (most accurate) and easiest way to measure - lie on floor, feet against wall, get somebody to mark top of your head. Turn 90 degrees and lie on front so your arm span covers the area where your body was. The difference between the previous mark, and where your fingertips reach, in inches, is your ape index. If arm span is longer it's positive, if height is longer it's negative.
Most people are slightly positive.
I'm +4.