AI need a cake to feed 70. Using the cake calculator I get 72 servings using 6-8-12 inch tiers. Will that look ok or out of balance? Thanks.

ADepending on the design it could look out of balance. But for the most part if it's perfectly even and lined.up and smooth and decorated nicely, then it will look fine.

This cake I did is a 8-10-14. you're seeing it from the side. 

front

We do 6, 8, 12's all the time, and they look great! Sometimes I like them better than 6, 8, 10's, it gives a little more interest to the look. 

AThanks for all the replies. . @hotbaker your cake is beautiful and the tiers look fine together.

Thanks :) Best of luck!