Optimus is nearly always six meters or roughly 19.6 feet tall. The live-action movies gave Optimus Prime a significant boost in height, making him 28 feet tall, which is the tallest he's ever been outside the popular IDW comics, where he stands at a monstrous 38 feet tall.
Despite no longer being a member, he maintains his military ranking of "Prime". The scale chart released for the series indicates Optimus Prime stands about 22 feet tall.
The producers said that they made him as mute, to show that his bond with Sam went beyond words. Bay stated in an early interview that Bumblebee stands about 17.5 feet tall (5.33 m), but the official guide to the Transformers video game says he is 16 feet tall (4.88 m).
While the concept art intends for him to be larger, standing at least at 50 feet tall compared to a human, the official AR statue website app depicts Primal at 13'2" in beast mode. As a contrast to the more static faces of the Autobots, Steven Caple Jr.
Transformers Size Comparison - Optimus Prime Evolution
Why is Optimus Prime so big?
He's the result of six Decepticons known as the Constructicons merging into one, so he is understandably larger than most Autobots or Decepticons. Likewise, this combined form has more members than similar groups, who are usually only made up of five Transformers.
According to an early interview with Michael Bay, Megatron stands at 41 feet (12 m) tall, but according to his profile in the second issue of the Transformers UK comic Megatron stands "35 feet (11 m) tall" and weighs 8.6 tons.
In The Transformers: The Movie, Unicron's height appears to be anywhere from several kilometers (as when handling Galvatron) to several hundred kilometers (as when attacking and destroying Lithone and Cybertron's moons, and attacking Cybertron).
Autobots can also age, just much slower than humans, for example Optimus Prime is approximately 9 million years old, which is 2 million earlier than the evolution of humans.
Starscream is a Cybertronian mech which means he has a humanoid root-mode and an alt-mode which can be a vehicle or an object. Starscream's alt-mode is a plane. According to Character Profile Wiki, Starscream is 7 meters (20 feet) tall in his root mode and weighs about 120 tons.
Standing 170 feet (52 m) tall and reaching speeds of 65 miles per hour (105 km/h), it opened in 1988 as the world's tallest and fastest looping roller coaster with a record-breaking seven inversions: three vertical loops, a boomerang (also known as a batwing), and two regular corkscrews.
His Hasbro battle bio states that he is 15 ft. tall and that he is a master in almost every form of martial arts on Cybertron. In Revenge of the Fallen, Sideswipe has 4 lines and first appears in the chase in Shanghai, China, pursuing the Decepticon Sideways.
Optimus Prime sacrificed himself, transforming into another dimension, leaving his son; Rodimus to carry on and maintain peace, only a few short episodes after his rebirth. Later, Prime would make a final and permanent return in the Japanese "Transformers" continuity, Battlestars: Return of Convoy.
According to an early interview with Michael Bay, Ironhide stands at 26 feet tall, but the scale of his Voyager class toy would suggest he stands closer to 21 feet tall. The official guide to the Transformers video game says he is 22 feet tall.
So with that in mind, to defeat Transformers Unicron whose size is larger than a planet, Primus must also have a large size. Primus itself is not as big as Unicron, but there is a possibility that it could reach the size of the planet Jupiter.
Unicron would win, Unicron has destroyed the Transformers Multiverse before and is currently on round 2 of Multiversal destruction, He's a primordial abstract Lovecraftian horror from before the modern Multiverse existed, even him moving has destroyed Galexies: Who would win, Unicron or Batman?
From a height standpoint, this figure is about 7 inches (about 17.78 centimeters), aligning him fairly well with the two previous Voyager Class Optimus Prime figures (though "Combiner Wars" Optimus is much bigger).
Bumblebee is often referred to as the 'youngest' even though it isn't technically true (Lotta created cold came after) but he is believed to be the last to be born naturally of the spark fields, which would make him fairly old even with being 'young'. It would still put him at something like 8 million years old or so.
Arcee is a small robot (15 ft), with blue paint primarily, black paint as the secondary, and little areas covered in pink, such as her head crest. She has black feet, hands and a dark grey midriff.
