An adult woolly rhinoceros typically measured 3 to 3.8 metres (9.8 to 12.5 ft) from head to tail, with an estimated weight of around 1,800–2,700 kg (4,000–6,000 lb) or 2,000 kg (4,400 lb).
It grew up to 2 m (6.6 ft) tall at the shoulder, about the same size as the white rhinoceros.
A one-month-old calf was about 120 centimetres (3.9 ft) in length and 72 centimetres (2.36 ft) tall at the shoulder.
The two horns were made of keratin, with one long horn reaching forward, and a smaller horn between the eyes.
Compared to other rhinoceroses, the woolly rhinoceros had a longer head and body, and shorter legs.
Its shoulder was raised with a powerful hump, used to support the animal's massive front horn.
The hump also contained a fat reserve to aid survival through the desolate winters of the mammoth steppe.

Frozen specimens indicate that the rhino's long fur coat was reddish-brown, with a thick undercoat that lay under a layer of long, coarse guard hair thickest on the withers and neck.
Shorter hair covered the limbs, keeping snow from attaching.
The body's length ended with a 45 to 50 centimetres (1.48 to 1.64 ft) tail with a brush of coarse hair at the end.
Females had two nipples on the udders.

The woolly rhinoceros had several features reducing the body's surface area and minimized heat loss.
Its ears were no longer than 24 centimetres (9.4 in), while those of rhinos in hot climates are about 30 centimetres (12 in).
Their tails were also relatively shorter.
It also had thick skin, ranging from 5 to 15 millimetres (0.20 to 0.59 in), heaviest on the chest and shoulders.
An adult woolly rhinoceros typically measured 3 to 3.8 metres (9.8 to 12.5 ft) from head to tail, with an estimated weight of around 1,800–2,700 kg (4,000–6,000 lb) or 2,000 kg (4,400 lb). It grew up to 2 m (6.6 ft) tall at the shoulder, about the same size as the white rhinoceros. A one-month-old calf was about 120 centimetres (3.9 ft) in length and 72 centimetres (2.36 ft) tall at the shoulder. The two horns were made of keratin, with one long horn reaching forward, and a smaller horn between the eyes. Compared to other rhinoceroses, the woolly rhinoceros had a longer head and body, and shorter legs. Its shoulder was raised with a powerful hump, used to support the animal's massive front horn. The hump also contained a fat reserve to aid survival through the desolate winters of the mammoth steppe.
Frozen specimens indicate that the rhino's long fur coat was reddish-brown, with a thick undercoat that lay under a layer of long, coarse guard hair thickest on the withers and neck. Shorter hair covered the limbs, keeping snow from attaching. The body's length ended with a 45 to 50 centimetres (1.48 to 1.64 ft) tail with a brush of coarse hair at the end. Females had two nipples on the udders.
The woolly rhinoceros had several features reducing the body's surface area and minimized heat loss. Its ears were no longer than 24 centimetres (9.4 in), while those of rhinos in hot climates are about 30 centimetres (12 in). Their tails were also relatively shorter. It also had thick skin, ranging from 5 to 15 millimetres (0.20 to 0.59 in), heaviest on the chest and shoulders.
Woolly rhinoceros