45 t99,200 lb
The house from Up weighs about 45 tonnes (100,000 lb), going by a house mover’s estimate that Wired asked for in 2009, the figure most later calculations reuse. Pixar never published an official weight, and estimates for a small wooden house like Carl’s run from about 10 to 70 tonnes.
| Heavy end for a typical US houseSlate, citing the Seattle Times: most houses weigh 80,000 to 160,000 lb | 72.6 t160,000 lb |
|---|---|
| Wired’s estimate for Carl’s house100,000 lb, after asking a house mover (2009); the figure we use | 45.4 t100,000 lb |
| Light end for a typical US houseThe same Slate range, 80,000 lb | 36.3 t80,000 lb |
| Three-bedroom wooden houseRoyal Society of Chemistry article: 10 to 25 tonnes | 25 t55,100 lb |
| Real-life replica (National Geographic, 2011)A purpose-built light house, about 2,000 lb, flown with 300 weather balloons | 907 kg2,000 lb |
Pixar has never given the house a weight. The number everyone uses comes from Wired, which asked a house mover in 2009 and got about 100,000 lb (45.4 tonnes). Slate, physicist Rhett Allain and a group of University of Leicester physics students all built their balloon sums on that figure, and the game rounds it to 45 tonnes.
It is a sensible middle value rather than a measurement. Slate notes that most American houses weigh 80,000 to 160,000 lb (36 to 73 tonnes), and Up co-director Pete Docter described Carl’s house as 1,800 square feet. A Royal Society of Chemistry article puts a three-bedroom wooden house like the one in the film lower, at 10 to 25 tonnes. None of these counts the foundation, which the house leaves behind when it tears free.
Pixar’s animators drew 10,297 balloons for the floating scenes and 20,622 for the lift-off. Docter told Ballooning magazine that Pixar’s technicians had worked out the real number: 23.5 million party balloons for a house like Carl’s. The film settled on far fewer.
Slate redid the sum with the 100,000 lb figure. An 11-inch party balloon lifts about 4.8 g, so you would need roughly 9.4 million. With 3-foot balloons it drops to about 105,854, though their latex alone would add some 6,615 lb. Rhett Allain found that a single helium balloon would need a radius of about 23 m to do the job.
For the film’s 10,297 balloons to carry 45 tonnes, each one would have to lift about 4.4 kg. Helium lifts roughly 1.1 kg per cubic metre, so every balloon would need to be about 2 m (6.5 ft) wide, before counting its own weight and string. And if the house had stayed bolted to a concrete foundation, Leicester students worked out it would take 5 to 9 billion party balloons to rip it free.
In 2011 the National Geographic Channel show How Hard Can It Be? built a 16 by 16 ft house weighing about 2,000 lb (900 kg) and flew it, crew aboard, to 10,000 ft from an airfield outside Los Angeles. It took 300 weather balloons, each 8 ft tall and filled from a whole tank of helium. Guinness lists it as the largest object lifted by helium balloons, with a total load of 1,966 kg (4,335 lb).
Each balloon carried roughly 6.6 kg, so lifting a 100,000 lb house the same way would take around 7,000 of them, before adding the extra rigging. That is fewer balloons than the film shows, but every one would be 8 ft tall, far bigger than the ones Carl uses.
About 100,000 lb (45 tonnes). That is Wired’s estimate from a house mover, not an official Pixar number, and a typical American house can weigh anywhere from 80,000 to 160,000 lb.
According to Disney, the animators used 10,297 balloons for the floating scenes and 20,622 for the moment the house lifts off.
Pixar’s technicians estimated 23.5 million party balloons. Slate’s calculation for a 100,000 lb house gives about 9.4 million party balloons, or around 106,000 balloons 3 ft across, plus extra to carry the balloons themselves.
Yes. In 2011 a National Geographic Channel show flew a 4,335 lb house to 10,000 ft with 300 large weather balloons, a Guinness world record. The house itself weighed only about 2,000 lb, built to be a small fraction of a real one.
Pete Docter described it as an 1,800 square foot house, which is where the balloon estimates by Pixar and Slate start from.
Last checked October 2, 2026.
