No. Use the formula I gave in the previous post. For your example of +50% and then -25%, the correct average annual return is {(1+0.5)*(1-0.25)}^(1/2) -1 = 0.0607 = 6.07%. For k years with returns r1, r1, ... rk, the correct average annual return is {(1+r1)*(1+r2)*...*(1+rk)}^(1/k)-1. The post you replied to gives Excel formula for computing this. Jim