This guy could really throw his weight around.

Scientists have unveiled body weight estimates for an astounding 426 different dinosaur species using a formula based on the thickness of their leg bones, crowning the truly immense long-necked Argentinosaurus as the biggest of them all.

That plant-eating dinosaur weighed an earth-shaking 90 tons when it lived about 90 million years ago in Argentina. It is the largest known land creature in the planet’s history.

“Argentinosaurus, that’s the champion,” Oxford University paleontologist Roger Benson, who led the study, said in a telephone interview. “It’s colossal.”

More than 1,000 species of dinosaurs have been identified but many are known from only fragmentary fossil remains

In their dinosaur ‘weigh-in’, the scientists included birds, which arose roughly 150 million years ago within a group of feathered dinosaurs called maniraptorans. A sparrow-sized bird called Qiliania that lived about 120 million years ago in China earned the distinction of being the smallest dinosaur, weighing a mere 15 grams.

Benson noted that Argentinosaurus was about six million times the weight of Qiliania, and that both still fit within the dinosaur family.

“That seems amazing to me,” added Benson, whose study was published in the journal Public Library of Science Biology.

The largest meat-eating dinosaur was Tyrannosaurus rex, which weighed seven tons and is also the largest known land predator of all time.

The T. rex edged out another super predator that some scientists had once figured was bigger based on the length of its skull, Giganotosaurus, which lived alongside Argentinosaurus in ancient South America.

The study estimated Giganotosaurus at about six tons, pretty darned big, but just a bit shy of dethroning T. rex.

More than 1,000 species of dinosaurs have been identified but many are known from only fragmentary fossil remains.