How Big Do Crocodiles Get? Sizes of the Largest Species

How big is the largest crocodile?

The saltwater crocodile (Crocodylus porosus), found from eastern India through Southeast Asia to New Guinea and northern Australia, is the largest living reptile. Adult males typically measure 3.5 to 5 m (11.5 to 16.5 ft) and weigh roughly 200 to 1,000 kg (440 to 2,200 lb). A small number of very old males pass 6 m (20 ft).

Females are far smaller, usually 2.5 to 3 m (8 to 10 ft) and rarely more than 3.5 m (11.5 ft). Estimates from the biggest known skulls suggest that the very largest males may have approached 7 m (23 ft), but no crocodile that long has ever been measured with a tape.

How big do Nile crocodiles get?

The Nile crocodile is the second-largest species and Africa’s biggest reptile. Adult males usually measure 3.5 to 5 m (11.5 to 16.5 ft) and weigh about 150 to 750 kg (330 to 1,650 lb), while females measure 2.2 to 3.8 m (7 to 12.5 ft). Exceptional males pass 5.5 m (18 ft) and 1,000 kg (2,200 lb), and a few historical reports describe animals over 6 m (20 ft), though such records are rare and hard to check today.

Many older size figures for “Nile crocodiles” also included the smaller West African crocodile, which scientists now treat as a separate species that usually grows to only 2 to 3 m (6.5 to 10 ft).

Sizes of crocodiles and their relatives compared

The American alligator is included for comparison: a big male is longer than most crocodile species, but well short of the largest saltwater and Nile crocodiles.

Record crocodiles and unreliable claims

The best-documented giant is Lolong, a male saltwater crocodile caught in Bunawan, in the Philippine province of Agusan del Sur, in 2011. Crocodile researcher Adam Britton measured him at 6.17 m (20 ft 3 in), with a weight of about 1,075 kg (2,370 lb), and Guinness World Records certified him in 2012 as the largest crocodile in captivity. He died in 2013. Cassius, a 5.48 m (18 ft) saltwater crocodile on Green Island in Queensland, Australia, then held the captive title until his death in 2024.

Wild records are harder to confirm. A saltwater crocodile that drowned in a fishing net in Papua New Guinea in 1979 is estimated, from its preserved skin and head, to have measured about 6.3 m (20 ft 8 in) in life.

Many famous claims do not hold up:

• “Krys”, Queensland, 1957: reported at 8.63 m (28 ft 4 in), but no measurements were verified and no remains survive.
• Bay of Bengal, 1840: reported at about 10 m (33 ft), yet the skull suggests an animal under 6 m (20 ft).
• Bhitarkanika, India: a male estimated at about 7 m (23 ft) in 2006, judged by eye rather than measured.
• Gustave, Burundi: a Nile crocodile estimated at over 6 m (20 ft) that has never been caught or measured.

Sizes get exaggerated because big crocodiles are usually judged from a distance, tanned skins stretch, and a good story tends to grow with every retelling.

Why are male crocodiles so much bigger than females?

Size differences between the sexes are normal in crocodilians, but the saltwater crocodile is extreme: big males can be twice as long as females and four to five times heavier, the largest gap of any species. In Nile crocodiles, females are about 30 percent smaller. The likely reason is competition, since bigger males win fights, hold the best stretches of river and get more chances to mate.

Do crocodiles keep growing all their lives?

Crocodiles start out tiny. Newly hatched Nile and saltwater crocodiles are only about 28 to 30 cm (11 to 12 in) long and weigh around 70 g (2.5 oz). Young crocodiles grow quickly, then growth slows sharply after they reach breeding age. Long-term tagging of American alligators has shown that growth in length eventually stops, which challenges the old idea that crocodilians grow without limit.

Weight rises much faster than length. Because a crocodile gets longer, wider and deeper at the same time, doubling its length multiplies its weight roughly eight times, which is why the last meter of growth turns a large crocodile into a giant one.

What is the smallest crocodile?

The smallest true crocodile is the dwarf crocodile (Osteolaemus) of West and Central African rainforests, which reaches about 1.5 to 1.9 m (5 to 6 ft) and 18 to 32 kg (40 to 70 lb). The smallest crocodilian of all is Cuvier’s dwarf caiman of South America, a member of the alligator family whose males average about 1.4 m (4.6 ft). To see how alligators and crocodiles differ beyond size, read alligator vs crocodile.