61.5 t136,000 lb
A megalodon about 16 m (52 ft) long weighed roughly 61.5 tonnes (about 135,600 lb), according to a 2022 3D model built from a fossil backbone found in Belgium. That is the most cited estimate, not a measurement: no complete skeleton exists, and other studies range from about 30 to over 100 tonnes.
| Gottfried et al. (1996), largestA hypothetical 20.3 m shark with great white proportions | 103 t227,000 lb |
|---|---|
| Shimada et al. (2025), largest24.3 m (80 ft), slender body; 83.6 to 104.7 t by model | 94 t207,000 lb |
| Cooper et al. (2022)The Belgian fossil at about 16 m, great white body shape | 61.6 t136,000 lb |
| Shimada et al. (2025), same Belgian shark16.4 m with a slender body; 26.9 to 33.7 t by model | 30 t66,100 lb |
Megalodon’s skeleton was made of cartilage, which rarely fossilises, so almost everything we know comes from teeth and a few vertebrae. One of the best fossils is a long run of vertebrae from a single shark, dug up in Belgium in the 1860s and kept at the Royal Belgian Institute of Natural Sciences. Growth rings in the vertebrae show it was about 46 years old when it died.
In 2022, Jack Cooper and colleagues combined scans of that backbone with a set of megalodon teeth and the body of a great white shark from South Africa to build the first 3D model of the whole animal. Their shark came out at about 16 m (52 ft) long and 61,560 kg (about 61.5 tonnes), which is the number used here.
The same model gave a stomach of almost 10,000 litres, a cruising speed of about 1.4 m per second (5 km/h) and a need for about 98,175 kcal a day, some 20 times what an adult great white needs. It could have swallowed prey up to 8 m (26 ft) long whole, and one such meal might have kept it going for about two months.
Cooper’s model assumes megalodon was shaped like a great white: thick and stocky. A 2025 study led by Kenshu Shimada argues that a body that stout would create too much drag for a shark this big, and that megalodon was probably slimmer, closer in build to a lemon shark.
With that slender shape, the Belgian shark (which they put at 16.4 m) would have weighed only about 30 tonnes, roughly half of Cooper’s figure. Cooper told National Geographic the slender body claim is "tentative at best", so the question is open: for the same animal, credible estimates differ by a factor of two.
Most length estimates come from teeth. In 1996, Michael Gottfried and colleagues scaled the largest known tooth against great white proportions and got 15.9 m, with a possible maximum near 20 m and up to about 103 tonnes. Later work by Shimada (2019), using a different method, put the largest teeth at only 14.2 to 15.3 m.
A 2015 study by Catalina Pimiento and Meghan Balk measured 544 teeth and found most megalodons were around 10 to 10.5 m (about 34 ft) long, with estimates from 2.2 to 17.9 m. In 2021, Victor Perez and colleagues used the combined width of a row of teeth instead of the height of one, and estimated the largest individuals at about 20 m (65 ft), give or take about 3 m.
The 2025 Shimada study went further. A vertebra from Denmark is 1.484 times bigger than the largest one in the Belgian shark, which would make its owner about 24.3 m (80 ft) long and about 94 tonnes with a slender body. The authors present this as the largest size the current fossils allow, not a typical one. They also estimate that newborn megalodons were already 3.6 to 3.9 m long.
The 2022 3D model puts a 16 m megalodon at about 135,700 lb (61,560 kg), roughly 68 US tons. The largest one suggested by the 2025 slender body study, at 24.3 m, would have weighed about 207,000 lb (94 tonnes).
No. NOAA Fisheries gives blue whales up to 110 ft and 330,000 lb (about 150 tonnes), more than twice the 61.5 tonne megalodon. Even the 94 tonne estimate for the largest possible megalodon is well short of a big blue whale.
Great whites reach up to about 21 ft (6.4 m) and 4,500 lb (about 2 tonnes), according to NOAA Fisheries. A 61.5 tonne megalodon was about 30 times heavier and around two and a half times longer.
The films show megalodons around 20 to 25 m long, larger than most scientists think a typical adult grew. The 2025 estimate of 24.3 m is a possible maximum from one vertebra, while most megalodons were probably closer to 10 m.
A 2019 study led by Robert Boessenecker found no reliable megalodon fossils younger than about 3.6 million years, a million years earlier than previously thought. Competition with the newly evolved great white shark may have helped drive it out.
Last checked October 2, 2026.
