35 kg77.2 lb
Sonic the Hedgehog weighs 35 kg (77.2 lb), according to his official profile on Sega’s Japanese Sonic Channel site, which gives his height as 100 cm (3 ft 3 in). That is modern Sonic. Sega lists Classic Sonic, the rounder 1990s design, at 25 kg, and Sonic the Werehog at 60 kg.
| Sonic the Werehog125 cm, from Sonic Unleashed | 60 kg132 lb |
|---|---|
| Modern Sonic100 cm, his standard profile | 35 kg77.2 lb |
| Classic Sonic75 cm, the 1990s design | 25 kg55.1 lb |
The number is on Sonic’s character page at Sonic Channel, Sega’s official Japanese site for the series. It lists him as a male hedgehog, 100 cm tall, weighing 35 kg, with a running speed of simply “supersonic”. Fan references such as Sonic Wiki Zone use the same profile as their source.
Shadow and Silver have exactly the same listing: 100 cm and 35 kg. Sega draws the three hedgehogs to the same model, so on paper they are interchangeable.
Classic Sonic, the short, round, black-eyed Sonic of the Mega Drive games, now has his own Sonic Channel profile: 75 cm and 25 kg. That was not always the case. The Sonic the Hedgehog Classic Style Guide, Sega’s design reference for that look, gave him the same 100 cm and 35 kg as modern Sonic.
Sonic the Werehog, the night form from Sonic Unleashed (2008), is the heaviest version. His profile gives 125 cm and 60 kg, with long stretching arms as his special skill. Super Sonic, the golden form he takes with the seven Chaos Emeralds, has no official weight.
On Sonic Channel, Tails is 80 cm and 20 kg, and Knuckles is 110 cm and 40 kg, the heaviest of the three friends. Amy is 90 cm, and her weight is listed only as “secret!”. Doctor Eggman is 185 cm and 128 kg, and Metal Sonic, a robot copy the same height as Sonic, weighs 125.2 kg, more than three and a half times the real thing.
A real hedgehog is far lighter. An adult European hedgehog weighs around 800 g in summer and about 1.1 kg at most, so Sonic is more than 40 times heavier than the animal he is based on.
Smash Bros. gives each fighter a weight value that sets how far attacks knock them back. It is not kilograms or pounds. In Brawl, Sonic’s 95 was the closest of any fighter to the average. He went to 94 in Smash 4, then dropped to 86 in Ultimate, which makes him a lightweight there: tied for 70th of 89 fighters with Duck Hunt. Bowser is the heaviest at 135 and Pichu the lightest at 62.
Sonic weighs 77.2 lb (35 kg). Classic Sonic is listed at 25 kg, about 55 lb.
Modern Sonic is 100 cm (3 ft 3 in) tall, according to Sega’s Sonic Channel profile. Classic Sonic is 75 cm (2 ft 6 in), and the Werehog is 125 cm (4 ft 1 in).
Neither. Sega lists both at 100 cm and 35 kg, and Silver has the same numbers too. Knuckles is heavier at 40 kg.
60 kg (132.3 lb) at 125 cm tall, according to Sega. That is 25 kg more than normal Sonic.
The films give no weight that we could find. Sonic does grow between the first and second film: animator Tyson Hesse said he was made taller to be closer to his height in the games.
Last checked October 2, 2026.
