100 kg220 lb
There is no official weight for Red, so the 100 kg (220 lb) is our estimate for the classic game bird. Assuming the game uses real gravity, physicist Rhett Allain worked out that Red is almost 70 cm tall, and a round bird that big would weigh about 100 kg. A real northern cardinal weighs 45 g (1.6 oz).
| Classic game Red at the game’s own scaleour estimate from Rhett Allain’s size of almost 70 cm | 100 kg220 lb |
|---|---|
| Movie Redlisted by the Angry Birds Wiki, unverified | 95 kg209 lb |
| Red as a real northern cardinalaverage adult, 44.8 g | 45 g1.59 oz |
| Red as a real desert cardinalmiddle of the usual 24 to 43 g | 34 g1.2 oz |
Rovio has never given Red a weight in real units, but the game itself hints at his size. In 2010 the physicist Rhett Allain tracked a bird’s flight in a Rovio walkthrough video for Wired. With no real scale to go on, he used the slingshot as his ruler, calling its length one unit, and found the bird falling with a steady acceleration of 2 slingshot lengths per second squared.
If the game runs on Earth gravity (9.8 m/s²), one slingshot length is about 4.9 m, so the slingshot is about 5 m tall. Measured against it, Red is almost 70 cm (2.3 ft) tall. Allain stopped at size and gave no mass.
The mass is our own arithmetic. A ball 70 cm across holds about 180 liters, or 0.18 m³ (4/3 × π × 35³ cm³). Plucked birds measured in the lab average about 0.73 kg per liter, lighter than water because of their air sacs, which gives about 131 kg. Red is a round, fluffy bird with a tuft on top, so part of that ball is feathers rather than body. Allowing for that, we round down to about 100 kg (220 lb); the size of that allowance is our assumption, not a measured figure.
The Angry Birds Wiki lists the film version of Red, who is taller and has legs, at 95 kg (209 lb). Its only reference is the 2022 Angry Birds MakerSpace episode Drone Woes, in which a delivery drone grabs Red and drags him down the stairs of his apartment building. The wiki’s own summary of that episode mentions no weight, and we could not check the figure, so treat it as unverified. It does land close to our estimate.
For the classic game bird, the closest thing to an official measurement is his profile in the Angry Birds Annual 2013, which, according to the Angry Birds Wiki, gives his height as 100 “Bird Measurement Units”, a joke unit with no conversion.
Red is usually described as a cardinal, but sources disagree on which one. The Angry Birds Wiki notes that a National Geographic Angry Birds book calls him a northern cardinal, while the book Angry Birds: Hatching a Universe and a Lego booklet for The Angry Birds Movie call him a desert cardinal (the pyrrhuloxia).
Real northern cardinals are 21 to 23.5 cm (8.3 to 9.3 in) long including the tail and weigh 33.6 to 65 g, with an average of 44.8 g (1.6 oz). Desert cardinals are about 21 cm long and usually weigh 24 to 43 g (0.8 to 1.5 oz). At the game’s scale, Red would be over 2,000 times as heavy as a real cardinal.
There is no official figure. Our estimate for the classic game bird is about 100 kg, or 220 lb, based on the size the game’s physics implies. The Angry Birds Wiki lists the movie version at 95 kg (209 lb), a figure we could not verify.
Physicist Rhett Allain worked out that if the game uses Earth gravity, the slingshot is about 5 m tall and Red is almost 70 cm (2.3 ft) tall. A real cardinal is only 21 to 23.5 cm long.
No. Rovio has never given one for the classic game bird, and his official profile only gives his height as 100 “Bird Measurement Units”. The 95 kg listed for the movie version comes from a fan wiki and is unverified.
A cardinal, though sources differ: a National Geographic Angry Birds book says northern cardinal, while others say desert cardinal. A real northern cardinal weighs about 45 g.
Last checked October 3, 2026.
