34 kg75 lb
Baymax weighs about 34 kg, or 75 lb. That is Disney’s own figure: Walt Disney Studios described the “real” Baymax of Big Hero 6 as roughly 6 ft tall and about 75 pounds. It covers the soft, inflatable healthcare robot on his own, since no official weight exists for his armor.
In February 2015, to promote the film’s home release, Disney sent a 40 ft inflatable Baymax on a tour of US cities. The press material that came with it gave quick facts on both: the touring balloon weighs more than 300 pounds, while the Baymax in the movie is “estimated to be 6 feet tall (7 feet tall when meched out in super suit) and about 75 pounds.” That is 34 kg, the number we use.
Disney called it an estimate, and its height is a round number too. Fan wikis and Science News Explores put him at 6 ft 2 in (1.88 m). Either way the weight stays the same, and no official source gives a separate figure for Baymax in either of his armored suits.
Inside the white vinyl is a carbon fiber skeleton, plus his actuators, battery and the chip port on his chest. Everything else is air. According to The Art of Big Hero 6, the designers made his vertebrae, arms and lower legs deflatable and gave his other “bones” joints so the whole robot folds into a small charging case.
Here is a rough estimate of our own. Treat his torso as an egg shape about 1.2 m tall, 1 m wide and 0.75 m deep, and it holds about 0.47 m³. Add his head and limbs and he fills around 0.6 m³. The air inside weighs well under 1 kg, so nearly all of his 34 kg is hardware. His average density works out to about 57 kg per m³, under a seventeenth of water’s. A person filling the same space would weigh around 600 kg.
That fits the film. In one scene the team’s car sinks in the bay, and Baymax takes off his armor and carries them all up to the surface. Unarmored, he is a very good float.
Co-director Don Hall got the idea at Carnegie Mellon University’s Robotics Institute, where Chris Atkeson’s lab showed him an inflatable robot arm built by PhD student Siddharth Sanan. The lab was working on soft robots that could safely feed, dress and bathe elderly or disabled people. Hall told CMU News the soft robotics were their ticket to a robot audiences had never seen.
Lightness is the whole point. Atkeson told Science News Explores that a big robot like Baymax needs to be lightweight to keep people and pets safe. The same article notes the snag for a real one: motors, batteries, sensors and above all an air compressor add weight, and a compressor would be too heavy for the robot to carry.
About 75 lb, according to Walt Disney Studios. That equals 34 kg.
Disney’s 2015 press facts say about 6 ft, or 7 ft in his super suit. Fan wikis and Science News Explores give 6 ft 2 in (1.88 m).
No. At 75 lb he weighs well under half of the average American man, who is about 199 lb according to the CDC, even though Baymax is taller and much wider.
There is no official figure. Disney only says the suit makes him about 7 ft tall, and the films never put a number on the armor itself.
The 40 ft promotional inflatable that toured the US in 2015 weighs more than 300 lb, by Disney’s count. A Baymax built like the film’s and scaled up to the balloon’s 35 ft body would weigh about 200 times his normal 75 lb, roughly 15,000 lb.
Last checked October 2, 2026.
