Argentinosaurus is among the largest known land animals, although its exact size is difficult to estimate due to the incompleteness of its remains.
To counter this problem, palaeontologists can compare the known material to that of smaller related sauropods known from more complete remains.
The more complete taxon can then be scaled up to match the dimensions of Argentinosaurus.
Mass can be estimated from known relationships between certain bone measurements and body mass, or through determining the volume of models.

A reconstruction of Argentinosaurus created by Gregory Paul in 1994 yielded a length estimate of 30–35 metres (98–115 ft).
Later that year, estimates by Bonaparte and Coria suggesting a hind limb length of 4.5 metres (15 ft), a trunk length (hip to shoulder) of 7 metres (23 ft), and an overall body length of 30 metres (98 ft) were published.
In 2006, Kenneth Carpenter reconstructed Argentinosaurus using the more complete Saltasaurus as a guide and estimated a length of 30 metres (98 ft).
In 2008, Jorge Calvo and colleagues used the proportions of Futalognkosaurus to estimate the length of Argentinosaurus at less than 33 metres (108 ft).
Holtz gave a higher length estimate of 36.6 metres (120 ft) in 2012.
In 2013, William Sellers and colleagues arrived at a length estimate of 39.7 metres (130 ft) and a shoulder height of 7.3 metres (24 ft) by measuring the skeletal mount in Museo Carmen Funes.
During the same year, Scott Hartman suggested because Argentinosaurus was then thought to be a basal titanosaur, it would have a shorter tail and narrower chest than Puertasaurus, which he estimated to be about 27 metres (89 ft) long, indicating Argentinosaurus was slightly smaller.
In 2016, Paul estimated the length of Argentinosaurus at 30 m (98 ft).
Paul estimated a greater length of 35 metres (115 ft) or greater in 2019, restoring the unknown neck and tail of Argentinosaurus after those of other large South American titanosaurs.

Paul estimated a body mass of 80–100 tonnes (88–110 short tons) for Argentinosaurus in 1994.
In 2004, Mazzetta and colleagues provided a range of 60–88 tonnes (66–97 short tons) and considered 73 tonnes (80 short tons) to be the most likely mass, making it the heaviest sauropod known from good material.
Holtz estimated a mass of 73–91 tonnes (80–100 short tons) in 2007.
In 2013, Sellers and colleagues estimated a mass of 83.2 tonnes (91.7 short tons) by calculating the volume of the aforementioned Museo Carmen Funes skeleton.
In 2014, Roger Benson and colleagues estimated the mass of Argentinosaurus at 90 tonnes (99 short tons).
In 2016, using equations that estimate body mass based on the circumference of the humerus and femur of quadrupedal animals, Bernardo Gonzáles Riga and colleagues estimated a mass of 96.4 tonnes (106.3 short tons).
Paul listed Argentinosaurus at 50 tonnes (55 short tons) or more in the same year.
In 2017, José Carballido and colleagues estimated its mass at over 60 tonnes (66 short tons).
In 2019, Paul gave a mass estimate of 65–75 tonnes (72–83 short tons) based on his skeletal reconstructions (diagrams illustrating the bones and shape of an animal) of Argentinosaurus in dorsal and lateral view.

While Argentinosaurus was definitely a massive animal, there is disagreement over whether it was the largest known titanosaur.
Puertasaurus, Futalognkosaurus, Dreadnoughtus, Paralititan, "Antarctosaurus" giganteus, and Alamosaurus have all been considered to be comparable in size to Argentinosaurus by some studies, although others have found them to be notably smaller.
In 2017, Carballido and colleagues considered Argentinosaurus to be smaller than Patagotitan, since the latter had a greater area enclosed by the neural spine, diapophyses, and parapophyses of its anterior dorsal vertebrae.
However, Paul found Patagotitan to be smaller than Argentinosaurus in 2019, due to the latter's dorsal column being considerably longer.
Even if Argentinosaurus was the largest-known titanosaur, other sauropods including Maraapunisaurus and a giant mamenchisaurid, may have been larger, alth
Argentinosaurus is among the largest known land animals, although its exact size is difficult to estimate due to the incompleteness of its remains. To counter this problem, palaeontologists can compare the known material to that of smaller related sauropods known from more complete remains. The more complete taxon can then be scaled up to match the dimensions of Argentinosaurus. Mass can be estimated from known relationships between certain bone measurements and body mass, or through determining the volume of models.
A reconstruction of Argentinosaurus created by Gregory Paul in 1994 yielded a length estimate of 30–35 metres (98–115 ft). Later that year, estimates by Bonaparte and Coria suggesting a hind limb length of 4.5 metres (15 ft), a trunk length (hip to shoulder) of 7 metres (23 ft), and an overall body length of 30 metres (98 ft) were published. In 2006, Kenneth Carpenter reconstructed Argentinosaurus using the more complete Saltasaurus as a guide and estimated a length of 30 metres (98 ft). In 2008, Jorge Calvo and colleagues used the proportions of Futalognkosaurus to estimate the length of Argentinosaurus at less than 33 metres (108 ft). Holtz gave a higher length estimate of 36.6 metres (120 ft) in 2012. In 2013, William Sellers and colleagues arrived at a length estimate of 39.7 metres (130 ft) and a shoulder height of 7.3 metres (24 ft) by measuring the skeletal mount in Museo Carmen Funes. During the same year, Scott Hartman suggested because Argentinosaurus was then thought to be a basal titanosaur, it would have a shorter tail and narrower chest than Puertasaurus, which he estimated to be about 27 metres (89 ft) long, indicating Argentinosaurus was slightly smaller. In 2016, Paul estimated the length of Argentinosaurus at 30 m (98 ft). Paul estimated a greater length of 35 metres (115 ft) or greater in 2019, restoring the unknown neck and tail of Argentinosaurus after those of other large South American titanosaurs.
Paul estimated a body mass of 80–100 tonnes (88–110 short tons) for Argentinosaurus in 1994. In 2004, Mazzetta and colleagues provided a range of 60–88 tonnes (66–97 short tons) and considered 73 tonnes (80 short tons) to be the most likely mass, making it the heaviest sauropod known from good material. Holtz estimated a mass of 73–91 tonnes (80–100 short tons) in 2007. In 2013, Sellers and colleagues estimated a mass of 83.2 tonnes (91.7 short tons) by calculating the volume of the aforementioned Museo Carmen Funes skeleton. In 2014, Roger Benson and colleagues estimated the mass of Argentinosaurus at 90 tonnes (99 short tons). In 2016, using equations that estimate body mass based on the circumference of the humerus and femur of quadrupedal animals, Bernardo Gonzáles Riga and colleagues estimated a mass of 96.4 tonnes (106.3 short tons). Paul listed Argentinosaurus at 50 tonnes (55 short tons) or more in the same year. In 2017, José Carballido and colleagues estimated its mass at over 60 tonnes (66 short tons). In 2019, Paul gave a mass estimate of 65–75 tonnes (72–83 short tons) based on his skeletal reconstructions (diagrams illustrating the bones and shape of an animal) of Argentinosaurus in dorsal and lateral view.
While Argentinosaurus was definitely a massive animal, there is disagreement over whether it was the largest known titanosaur. Puertasaurus, Futalognkosaurus, Dreadnoughtus, Paralititan, "Antarctosaurus" giganteus, and Alamosaurus have all been considered to be comparable in size to Argentinosaurus by some studies, although others have found them to be notably smaller. In 2017, Carballido and colleagues considered Argentinosaurus to be smaller than Patagotitan, since the latter had a greater area enclosed by the neural spine, diapophyses, and parapophyses of its anterior dorsal vertebrae. However, Paul found Patagotitan to be smaller than Argentinosaurus in 2019, due to the latter's dorsal column being considerably longer. Even if Argentinosaurus was the largest-known titanosaur, other sauropods including Maraapunisaurus and a giant mamenchisaurid, may have been larger, alth
Argentinosaurus