My 6x6 negs get printed to 5x5" or 6x6" on 8x10 paper. 10x10" on 11x14 paper and 14x14" on 16x20 paper.
6x4.5 and 35mm gets printed to 5x7" or 5.25x7" or 6x8" on 8x10 paper. 9x12" on 11x14. And 13.5x18" on 16x20.
The hardest part for me is deciding how big of a print I want from a negative!