Hi! I am making a baby shower cake that is round. It looks like a tub. I have made it with 3 layers but it was only a 9 in round. How big should I go to feed about 40 ppl?

Thanks!

Welcome!!!

According to Earlene's serving chart, I would use a 12" - it feeds 45.
http://www.earlenescakes.com/ckserchart.htm

According to Wilton's serving chart, you could use a 10" - it feeds 38.
http://www.wilton.com/wedding/cakeinfo/cakedata.cfm

Thank you so much! That helps me tremendously!