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How Big Is a Mosasaurus?

A mosasaurus is about 49 ft (15 m) long. That is about 8.8 times as long as the average man is tall. A huge marine reptile from the time of the dinosaurs.

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How big is a mosasaurus compared to the average man?

A mosasaurus is about 8.8 times as long as the average man is tall. A mosasaurus is 8.8× the size of the average man: about 8.8 average men lined up would match it.

Mosasaurus length in feet, inches, centimeters and meters

A mosasaurus measures:

Unit	Value
Feet and inches	49 ft 3 in
Inches	591 in
Centimeters	1500 cm
Meters	15 m

Mosasaurus size facts

Mosasaurus hoffmannii is estimated at about 12 to 17 meters long.
It was a giant sea lizard, related to snakes and monitor lizards, not a dinosaur.

How does a mosasaurus compare to other things?

A mosasaurus next to 24 things of similar size, plus some everyday references:

Thing	Size	Compared to Mosasaurus
Sun	865,000 miles (1,393,000 km) across	92.8 million× bigger
Earth	7,920 miles (12,740 km) across	849,000× bigger
Mount Everest	5.5 miles (8.849 km)	590× bigger
Eiffel Tower	1,083 ft (330 m)	22× bigger
Brachiosaurus	72 ft (22 m) long	23 ft (7 m) bigger
Semi-truck	72 ft (21.9 m) long	23 ft (6.9 m) bigger
Great Sphinx of Giza	66 ft (20 m)	16 ft (5 m) bigger
Oak tree	66 ft (20 m)	16 ft (5 m) bigger
Palm tree	66 ft (20 m)	16 ft (5 m) bigger
Sperm whale	52 ft (16 m) long	3 ft 3 in (100 cm) bigger
Megalodon	52 ft (16 m) long	3 ft 3 in (100 cm) bigger
Humpback whale	49 ft (15 m) long	0 pm smaller
Spinosaurus	46 ft (14 m) long	3 ft 3 in (100 cm) smaller
Hubble Space Telescope	43 ft (13.2 m) long	5 ft 11 in (180 cm) smaller
Titanoboa	43 ft (13 m) long	6 ft 7 in (200 cm) smaller
Giganotosaurus	41 ft (12.5 m) long	8 ft 2 in (250 cm) smaller
Tyrannosaurus rex	40 ft (12.3 m) long	8 ft 10 in (270 cm) smaller
School bus	40 ft (12.2 m) long	9 ft 2 in (280 cm) smaller
Whale shark	39 ft (12 m) long	9 ft 10 in (3 m) smaller
Giant squid	39 ft (12 m) long	9 ft 10 in (3 m) smaller
Fire truck	39 ft (12 m) long	9 ft 10 in (3 m) smaller
Iguanodon	33 ft (10 m) long	16 ft (5 m) smaller
Average man (world)	5 ft 7 in (171 cm)	8.8× smaller
Average woman (world)	5 ft 3 in (159 cm)	9.4× smaller

Where do these numbers come from?

Sizes are typical adult or reported values, rounded for readability. Read how we measure and compare sizes.

Silhouettes from PhyloPic: Mosasaurus by T. Michael Keesey. See credits.