I was justing reading some message on discord in a server for a dinosaur survival game. A guy made a post about how giganotosaurus should face up against Tyrannosaurus. I always tought rex was bigger (in weight since we usually count the weight as the size) but he stated that giga was heavier and bigger then Tyrannosaurus. I was reading some other post on reddit but many people seemed to say giga is bigger but alot of people saying Tyrannosaurus is bigger this got me a bit confused. Since Tyrannosaurus is more robust build and heavier right or am I wrong?

I was wondering if there are any widely agreed upon weight estimates for Giganotosaurus?

I've seen estimates for Giga ranging from 9 tonnes to 13.8 tonnes (Which would place it above T.rex which doesn't make much sense looking at how wider T.rex was) and for T.rex ranging from 8 tonnes to 10 tonnes.

Related to my recent post: T-Rex size comparison to human. Again, all in metric meters (human 1,8m to scale)

Since people asked for another one. Here is Giganotosaurus compared to the TRex specimen of my first post.

Considering Rex on the left side: Sue as an rather complete specimen. Second Goliath as presumably biggest specimen of rex found so far but only fragmentary (femur bone), its size is based on its bigger femur compared to other specimen. Third is a potential well above average rex specimen, which would be rare but within a realistic size range and most likely not close to the potential max size. No specimen that size was found so far.

Giganotosaurus on the right: Basically the same order. First, the rather complete specimen of giga with reliable measurements. Second, another Giganotosaurus specimen that was found really fragmentary (fragmentary jaw bone) about 5-8% bigger than the other one. And again, just as there were most likely well above average sized rexes, a potential above average Giganotosaurus.

Hint: We found many TRex so far. According to since its quite reliable to upscale a Theorpod based on its femur bone (especially when one compares the femur bones of the different rexes we found).

There is only the mentioned rather complete Giganotosaurus and the second potential bigger fragmentary one. Apparently its rather unreliable to upscale a Therpod based on its jaw and less reliable than an upscale based on the femur bone. Meaning its not that certain if the second specimen was really that big. Nevertheless, the Giganotosaurus found were statistically most likely average in size. So the bigger depictions here are within realistic size range.

Also: Measurements of the well preserved Giganotosaurus specimen differ depending on source. E.g. earlier estimates of the bone structure range from 3,5m to 3,6m at the hip. Newer estimates suggest 3,7m or more.

I got the exact size measurements of Sue from the field Museum. On her skeleton you have to add flesh and a rather neutral position (sue is depicted in a crouched position) to get a realistic size she had when still alive.

I have heard some facts or rumors that a Giganotosaurus is bigger than a Tyrannosaurs. Is that True?