Canadian Coast Guard recommends these weight loads based on the length a boat:
Length No. persons Max. Weight Load ----------------------------------------- 3 m 9.8' 2 185 kg 408 lb 3.7 m 12.1' 3 260 kg 573 lb 4 m 13.1' 4 335 kg 739 lb 5 m 16.4' 5 440 kg 970 lb