Zoom out from an average adult to an Argentinosaurus
An Argentinosaurus is too big to show next to an average adult in one picture, so here it is in 2 steps. Each step is drawn to its own scale and zooms out from the step before.
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Step 1 of 2 Human → Megalodon
A megalodon is about 8.6–15 times as long as an average adult is tall.
Step 1: Human and Megalodon at the same scale. -
Step 2 of 2 Megalodon → Argentinosaurus
An Argentinosaurus is about 1.4–2.3 times as long as a megalodon.
Step 2: Megalodon and Argentinosaurus at the same scale.
Dimensions
| Measurement | Metric | Imperial | Notes | Source |
|---|---|---|---|---|
| Length (estimated) | ≈ 35 m | ≈ 110 ft | Estimated nose-to-tail length; the museum stresses the exact size is hard to estimate from the incomplete fossils. Approximate | [1] |
| Mass (estimated) | ≈ 70,000 kg | ≈ 77 US tons | Estimated body weight; Britannica's dinosaur article independently gives an estimate of 70 metric tons. Approximate | [1] [2] |
About the Argentinosaurus
Argentinosaurus was a titanosaur, a type of long-necked, plant-eating sauropod, that lived in what is now Argentina about 90 million years ago in the Late Cretaceous. It is one of the largest land animals ever found: the Natural History Museum, London estimates it at about 35 metres long and 70,000 kg. Only an incomplete skeleton is known, so its true size is uncertain.
- Argentinosaurus kept growing through most of its life. Hatchlings would have taken about 15 years to reach adulthood, and were vulnerable to predators such as Giganotosaurus while they grew. [1]
- Other similarly huge dinosaurs, such as Patagotitan and Puertasaurus, were also titanosaurs. [1]
- It was named by Bonaparte and Coria in 1993. [1]
- A reconstruction at the Museo Municipal Carmen Funes in Plaza Huincul, Argentina, measures about 40 metres (131 feet) from head to tail. [2]
How many fit?
- ≈ 21 × Human · height lined up end to end match the Argentinosaurus · length (estimated)
- ≈ 830 × Human · body mass on the scales weigh as much as Argentinosaurus · mass (estimated)
- ≈ 1.4–2.3 × Megalodon · maximum length (estimates) lined up end to end match the Argentinosaurus · length (estimated)
Counts divide one sourced figure by another. "End to end" uses each object's main measurement; weight and volume rows appear only when both figures are sourced.
How it compares
- 21× An Argentinosaurus is about 21 times as long as an average adult is tall. See side by side
- 1.4–2.3× An Argentinosaurus is about 1.4–2.3 times as long as a megalodon. See side by side
- 1.2× An Argentinosaurus is about 1.2 times as long as an NBA basketball court. See side by side
- 1/1.1 An Argentinosaurus is about as long as a Boeing 737. See side by side
- 1/1.7 The Leaning Tower of Pisa is about 1.7 times as tall as an Argentinosaurus is long. See side by side
- 1/2.7 The Statue of Liberty is about 2.7 times as tall as an Argentinosaurus is long. See side by side
Factors compare the length (estimated) of an Argentinosaurus with each object’s own main measurement (height for a human). Where a size varies, the factor is given as a range.
Notes on these figures
- All sizes are estimates from a very incomplete skeleton.
- The Natural History Museum is not consistent: its Argentinosaurus page gives 70,000 kg, but its Brachiosaurus page says Argentinosaurus weighed 80,000 kg. The 70,000 kg figure is used because it is on the species' own page and matches Britannica's 70 metric tons.
- Britannica's Argentinosaurus page opens with an AI-generated summary quoting 37-40 m and up to 100 metric tons; it is labelled as AI-made and was not used for any measure.
- The 40 m figure in the facts is the size of a museum reconstruction, not a scientific estimate of the living animal.
Sources
- Natural History Museum, London, Argentinosaurus (Dino Directory). Accessed 25 September 2026.
- Encyclopaedia Britannica, Argentinosaurus. Accessed 25 September 2026.