The Colossal Titan weighs about 300 tonnes (roughly 660,000 lb) by our estimate. Attack on Titan never gives an official weight, only its 60 m height. A person scaled up to that height would weigh about 2,900 tonnes, but the series says titan bodies are abnormally light, so we took about a tenth of that.
At normal human densityA 70 kg, 1.73 m adult scaled up to 60 m
2,920 t6,440,000 lb
Our estimateAbout a tenth of that, for light titan flesh
300 t661,000 lb
Where the 300 tonnes comes from
The only official number is the height: 60 m (197 ft), as listed in Kodansha’s Attack on Titan Character Encyclopedia. Weight grows with the cube of height, because a body gets taller, wider and deeper all at once. 60 m is about 34.7 times a 1.73 m adult, and 34.7 × 34.7 × 34.7 is about 41,700. Multiply that by 70 kg and you get roughly 2,900 tonnes (a 1.70 m reference person gives about 3,100 t). That is what a Colossal Titan made of ordinary flesh would weigh.
But the series is clear that titan flesh is not ordinary. In chapter 20 of the manga (season 1, episode 15 of the anime), Hange tells Eren that they once kicked the head of a 3 m titan and were shocked by how light it was. Titans also seem to create mass out of nothing when they appear and turn to steam when they die. The story never says how light, so the tenth is our own call. It gives 300 tonnes, a body about a tenth as dense as water.
Treat 300 t as a ballpark, not a measurement. It is a reasonable middle ground between real-world physics and what the story shows.
How big that is
At 60 m the Colossal Titan can look over the 50 m Walls, which is the whole shock of the first episode. Otaku USA compares it to the Leaning Tower of Pisa. Ordinary titans are 2 to 15 m tall, and Eren’s Attack Titan is 15 m.
Four times the height means 64 times the weight, so at the same lightness a 15 m titan would come to under 5 tonnes. In everyday terms, 300 tonnes is about two blue whales, or a little more than an empty Airbus A380.
Steam, transformations and the Wall Titans
The Colossal Titan’s weight is not even fixed. It can blast out huge amounts of hot steam, but each blast burns away muscle, and if it keeps going it is reduced to a skeleton. That weakness is how the Survey Corps beat it at Shiganshina. It can also evaporate its whole body at once. Going the other way, Armin, whom the guidebook lists at 55 kg, becomes a 60 m giant in a flash.
The Walls themselves turn out to be packed with titans of the same type, each roughly as tall as the 50 m Walls. At our density, one would weigh about 170 tonnes. King Fritz claimed there were tens of millions of them. Rikao Yanagita’s The Science of Attack on Titan estimated about 585,000, which at 170 t each is still around 100 million tonnes of titan.
60 meters (197 feet), according to the official Attack on Titan Character Encyclopedia. Both Bertolt’s and Armin’s versions are that height. The 2015 live-action films made it much bigger, about 120 m.
Is there an official weight for the Colossal Titan?
No. The guidebooks give its height, and they list weights for the human characters, but no weight for the Titan itself. Any number you see, including ours, is an estimate.
Why are titans so light?
The story never fully explains it. Hange found titans abnormally light during their experiments, and titans break other rules too, creating mass when they transform and evaporating when they die. Outside the story, it also helps: a 60 m body of normal flesh would weigh around 2,900 tonnes and struggle to carry itself.
How much would the Colossal Titan weigh if it were made of normal flesh?
About 2,900 tonnes, or roughly 6.4 million pounds. That is a 70 kg adult scaled up to 60 m, which multiplies the weight by about 41,700.
Is the Colossal Titan the biggest titan?
Not quite. Rod Reiss’s titan stands about 120 m tall, and Eren’s final form is far larger still. Among the usual shifter titans, though, nothing else comes close: the others top out at roughly 15 to 17 m.
Sources
Colossus Titan, Attack on Titan Wiki (citing the Attack on Titan Character Encyclopedia)