SCALECHECK

True-scale A vs. B

Spinosaurus vs. T. rex: which was bigger?

Spinosaurus wins on displayed length at 14 m versus 12.5 m. T. rex wins on robust mass at about 8.4 tonnes versus 7.4 tonnes.

Spinosaurus14 m7.4 t
VS
T. rex12.5 m8.4 t
Spinosaurus and Tyrannosaurus rex compared beside an adult human
Spinosaurus and Tyrannosaurus rex compared beside an adult human
0 mRepresentative body length14 m
Spinosaurus14 m
T. rex12.5 m

All bars share one linear metre scale. Human height and animal body length use different orientations, noted on each detail page.

Interactive true-scale view

Spinosaurus and T. rex on one ground plane

Spinosaurus is 1.5 m longer; T. rex is about 1 tonne heavier. A 1.7 m human is included as a constant visual reference when it is not already one of the subjects.

Spinosaurus14 mDetailed 3D model
T. rex12.5 mDetailed 3D model
Human1.7 mDetailed 3D model

Quick answer

The measurable difference

Spinosaurus wins on displayed length at 14 m versus 12.5 m. T. rex wins on robust mass at about 8.4 tonnes versus 7.4 tonnes.

Why this matchup matters

Different bodies, not just different numbers

They represent two different ways to build a giant predator: a long, river-adapted spinosaur and a deep-bodied, bone-crushing tyrannosaur.

Human scale

How the gap feels

The 1.5 m length gap is almost one adult human. Yet the shorter T. rex carries roughly another tonne - the mass of a small car - in the ScaleCheck reconstruction.

Evidence boundary

What the comparison cannot prove

They never met. Spinosaurus lived in North Africa roughly 30 million years before T. rex appeared in North America.

Side-by-side data

Actual display values

SubjectLengthHeight / depthMassEvidence context
Spinosaurusabout 14 m longsail rising above a low, long bodyabout 7.4 tonnesThe first important fossils were destroyed in 1944, and later discoveries repeatedly changed the reconstruction. Length and locomotion remain active research topics.
T. rexabout 12.5 m longabout 4 m at the hipsabout 8.4 tonnes for a very large adultT. rex estimates vary by specimen. ScaleCheck uses 12.5 m and 8.4 tonnes to represent a very large adult rather than treating every individual as the same size.

Evidence

Sources and measurement notes

  1. Nature - Tail-propelled aquatic locomotion in a theropod dinosaur (2020)
  2. Natural History Museum - Spinosaurus facts and figures
  3. Natural History Museum - Tyrannosaurus facts and size

Subject profiles

Inspect each animal separately

Theropod dinosaur - spinosaurid

Spinosaurus

Length
14 m
Mass
7.4 t
View size profile

Theropod dinosaur - tyrannosaurid

T. rex

Length
12.5 m
Mass
8.4 t
View size profile

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