Here is a list I found for 4" squares and how many sqauares you might need for a quilt
Crib/Lap Quilt 36 x 50 inch - 4 sets of 50 squares (160 squares)
Twin Quilt 68 x 88 inch - 11 sets of 50 squares (520 squares)
Full Quilt 81 x 88 inch - 12 sets of 50 squares (600 squares)
Queen Quilt 88 x 96 inch - 14 sets of 50 squares (720 squares)
King Quilt 102 x 96 inch - 16 sets of 50 squares (800 squares)