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For both sexes, excluding the male's tusk, the total body size can range from 3.95 to 5.5 m (13.0 to 18.0 ft); the males are slightly larger than the females. The average weight of an adult narwhal is 800 to 1,600 kg (1,800 to 3,500 lb).
On very rare occasions the male narwhal may also grow a second tusk, however this is extremely unlikely. Female narwhals on the other hand rarely grow a visible tusk. As for their size these marine mammals can grow to be 13 -20 ft. long and weigh as much as 3,500 pounds.