Males are 330 and 420 mm (12–16 in) long. Females are 280–350 mm (11–13 in) long. In males, the tail is 132–294 mm (5–11 in) long. In females, the tail is 112 to 245 mm (4–9 in) long. Long-tailed weasels weighs between 3 and 9 ounces (85-267 g) with males being about twice as large as the females.