FENDER GUIDE SIZE Boat Boat Length Fender Diameter 18 ft – 30 ft 9" 30 ft - 45 ft 10" 45 ft - 60 ft 12" 60 ft - 100 ft 18" 100 ft - 200 ft 24" – 36" 200 ft – 400 ft 4', 6', or 8'
