The secondThe Fantastic Four: First Stepstrailer provides a clearer look at theMCU’s Galactus, whose full size is among the greatest in the franchise.The Fantastic Four: First Steps' second trailerreveals a few new details about the movie, includingJulia Garner’s Silver Surfer, Reed Richard’s stretching powers, and Sue Storm’s pregnancy. The second trailer also features a new shot of Galactus, though the Devourer of Worlds' full look may only be unveiled onceThe Fantastic Four: First Stepsarrives in theatersin July.
The Fantastic Four: First Stepsmarks the first time Galactus' original appearance will be translated to live-action faithfully.Fantastic Four: Rise of the Silver Surferfollows a similar storyline, but its Galactus adaptation is infamously inaccurate, as it looks and behaves like a cosmic cloud instead of an anthropomorphic cosmic entity with a consciousness of its own. While large,the MCU’s Galactus is far from a planet-sized character inThe Fantastic Four: First Steps' trailers, but his size is actually faithful to the source material.

How Tall MCU Galactus Is In The Fantastic Four: First Steps
Galactus' Size In The MCU Is Similar In His Marvel Comics Debut
The shadow cast by Galactus' head in the first and secondThe Fantastic Four: First Stepstrailers stretches from the Financial District up toward Midtown (4.5 miles / 7.24 km). The angle of the sunlight makes calculations variable, but assuming the angle ranges from 10° to 15°, the size of Galactus' head may range from 0.75 miles to 1.2 miles (1.2km - 1.9km). That means that Galactus' full body in this shot could be around 12 miles (19km) — close to the entire length of Manhattan and roughly three times larger than Mt. Everest. However,The Fantastic Four: First Steps' second trailer confirms that Galactus is able to size-shift.
As the trailers suggest, Galactus will shrink gradually as he arrives in New York, possibly going from planet-sized to city-sized to skyscraper-sized

The secondThe Fantastic Four: First Stepstrailer includes a new shot of Galactus' feet as he walks through the city. In this shot, Galactus is much smaller than he appears to be in the first shot of his shadow. Taking into account the length of an average Manhattan building (150 ft / 45.7 m), and assuming Galactus' foot length is roughly 15% of his height, Galactus would stand approximately 1,000 feet tall(304.8 meters) in this shot. That means Galactus might stand just a bit shorter than the Empire State Building as he walks through New York.
In the firstThe Fantastic Four: First Stepstrailer,Galactus can be seen walking beside the Statue of Liberty.Considering the Statue of Liberty stands at 305 ft (93 m) and it reaches Galactus' upper torso in this shot, then Galactus would be five to six times the Statue of Liberty’s total height — 1525 to 1830 ft (464 to 557 m).As the trailers suggest, Galactus will shrink gradually as he arrives in New York, possibly going from planet-sized to city-sized to skyscraper-sized. Measuring roughly the same as the Baxter Building in his final state, Galactus would still be larger than he was in his comic book appearance.

How Galactus Compares To The Tallest MCU Characters
Galactus May Be The Second Biggest MCU Villain Introduced So Far
The shot where Galactus appears at his biggest inThe Fantastic Four: First Stepstrailers makes him the third largest MCU characterafter Ego, whose planet form may be the same size as the Earth; and the Celestials, who stand at approximately 200 miles (483 km) tall. As Galactus shrinks, he would match the Avengers Tower’s 1,130 ft (344m). In his final state, a 1,000 ft tall Galactus would be taller than large characters such as Giant Man (65 ft / 20m) and Eitri (12 ft / 3.6 m). Of course, interdimensional entities like Eternity, Dormammu, and the Living Tribunal are not included in these measurements, as their size is too vague.
≈4000 miles

≈ 6400
12 miles / 1677 ft / 1,000 ft

19 km / 511 m / 304 m
1,130 ft

344 m
305 ft
93 m
65 ft
20 m
12 ft
3.6 m
10 ft
3 m
8 ft 5 in
2.56 m
8 ft 3 in
2.51 m
7 ft 10 in
2.38 m
5 ft 11 in
1.80 m
0 ft 1 in
2.54 cm
InThe Fantastic Four: First Steps, Galactus may first show up in his natural size, several times larger than Earth, before shrinking in order to interact with the Fantastic Four. It’s important to note that Galactus usually doesn’t consume planets like a regular person would eat a meal. Instead of ingesting planets through his mouth, Galactus absorbs their energy, destroying them in the process. Galactus also doesn’t need to be larger than a planet in order to consume it. He can drain a planet’s energy while standing on it, regardless of his current size.
How MCU Galactus’s Height Compares To The Marvel Comics
Galactus' Smallest Size From The Comics Is Even Smaller Than His MCU Counterpart’s
In his earliest comic book appearances, Galactus seemed to be two to two-and-a-half times the size of characters like the Thing and Thor while fighting or speaking with them. Over the years, Galactus' smallest size has increased, limiting himself to the size of a skyscraper as he interacts with other Marvel characters. At his biggest, Galactus has been able to hold entire planets in the palm of his hand.The Fantastic Four: First Stepsmay reduce this range a little, but Galactus' fluctuating size seems to be accurate.