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Adult mice have bodies that are 3-4 inches long with 3-4 inch tails. Adult rats are far heavier and longer: they can weigh ten times as much, averaging 350-450 grams for females and 450-650 for males (with an overall range of 200-800 grams). They have 9-11 inch long bodies and 7-9 inch tails (ref).
According to a University of Michigan resource on breeding mice for laboratory purposes, a female mouse can give birth to between four and eight litters each year. Each litter consists of an average of between six to eight mice. A female mouse reaches sexual maturity at between 6 and 8 weeks old. The gestation period for a litter typically lasts between 19 and 21 days. Mice are very common in laboratory research, especially in genetics, in part because of this quick generation time, but this quality also makes them a pervasive pest animal.