How many 16 x 16 stone blocks are needed for a 8 ft x 8 ft patio?

Answer 1

a 16 inch block is 16/12 = 1.33 feet; one block is 1.33 x 1.33 = 1.77 square feet

Since the patio is 8 x 8 = 64 sq ft, you need

64/1.77 = 36 blocks

You will need extras if coevrage is not even.