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The proportions of the known bones and comparisons with other sauropod relatives allow paleontologists to estimate the size of "Argentinosaurus". An early reconstruction by Gregory S. Paul estimated "Argentinosaurus" at between in length and with a weight of up to . In 2016 Paul listed "Argentinosaurus" at 30 metres in length but with a lower weight estimate of 50+ tonnes. The length of the skeletal restoration mounted in Museo Carmen Funes is long and tall at the shoulder. This is the longest reconstruction in a museum and contains the original material, including a mostly complete fibula.
Other estimates have compared the fragmentary material to relatively complete titanosaurs to help estimate the size of "Argentinosaurus". In 2006 Carpenter used the more complete "Saltasaurus" as a guide and estimated "Argentinosaurus" at in length. An unpublished estimate used published reconstructions of "Saltasaurus", "Opisthocoelicaudia", and "Rapetosaurus" as guides and gave shorter length estimates of between . Weight estimates are less common, but Mazzetta "et al." (2004) provide a range of , and consider to be the most likely, making it the heaviest sauropod known from good material. More recently, it was estimated at by calculating the volume of the aforementioned Museo Carmen Funes skeleton. Scott Hartman suggests that since "Argentinosaurus" is a basal titanosaur, it would have a shorter tail and narrower chest than "Puertasaurus", suggesting that it was slightly smaller than other giant titanosaurs such as "Puertasaurus" and "Alamosaurus".
30 metres