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How Big Is a Diplodocus?

A diplodocus is about 85 ft (26 m) long. That is about 15 times as long as the average man is tall. One of the longest dinosaurs, with a whip-like tail.

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How big is a diplodocus compared to the average man?

A diplodocus is about 15 times as long as the average man is tall. A diplodocus is 15.2× the size of the average man: about 15 average men lined up would match it. By volume, about 222 average men would fit inside a diplodocus.

Diplodocus length in feet, inches, centimeters and meters

A diplodocus measures:

Unit	Value
Feet and inches	85 ft 4 in
Inches	1,020 in
Centimeters	2600 cm
Meters	26 m

Diplodocus size facts

Diplodocus was about 24 to 26 meters long.
Most of that length was neck and tail.

How does a diplodocus compare to other things?

A diplodocus next to 25 things of similar size, plus some everyday references:

Thing	Size	Compared to Diplodocus
Sun	865,000 miles (1,393,000 km) across	53.6 million× bigger
Earth	7,920 miles (12,740 km) across	490,000× bigger
Mount Everest	5.5 miles (8.849 km)	340× bigger
Eiffel Tower	1,083 ft (330 m)	12.7× bigger
Niagara Falls	167 ft (51 m)	82 ft (25 m) bigger
Colosseum	157 ft (48 m)	72 ft (22 m) bigger
Christ the Redeemer	125 ft (38 m)	39 ft (12 m) bigger
Argentinosaurus	115 ft (35 m) long	30 ft (9 m) bigger
Blue whale	82 ft (25 m) long	3 ft 3 in (100 cm) smaller
Hot air balloon	82 ft (25 m)	3 ft 3 in (100 cm) smaller
Brachiosaurus	72 ft (22 m) long	13 ft (4 m) smaller
Semi-truck	72 ft (21.9 m) long	13 ft (4.1 m) smaller
Great Sphinx of Giza	66 ft (20 m)	20 ft (6 m) smaller
Oak tree	66 ft (20 m)	20 ft (6 m) smaller
Palm tree	66 ft (20 m)	20 ft (6 m) smaller
Sperm whale	52 ft (16 m) long	33 ft (10 m) smaller
Megalodon	52 ft (16 m) long	33 ft (10 m) smaller
Humpback whale	49 ft (15 m) long	36 ft (11 m) smaller
Mosasaurus	49 ft (15 m) long	36 ft (11 m) smaller
Spinosaurus	46 ft (14 m) long	39 ft (12 m) smaller
Hubble Space Telescope	43 ft (13.2 m) long	42 ft (12.8 m) smaller
Titanoboa	43 ft (13 m) long	43 ft (13 m) smaller
School bus	40 ft (12.2 m) long	45 ft (13.8 m) smaller
Average man (world)	5 ft 7 in (171 cm)	15.2× smaller
Average woman (world)	5 ft 3 in (159 cm)	16.4× 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: Diplodocus by Jagged Fang Designs. See credits.