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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).
01.10.2006 - Rats and mice are similar in appearance. In fact, people often confuse juvenile rats for mice, and the two do look extremely similar. While there are several species of rats and mice, I will examine the two most common ones, the Roof or Black Rat, and the House Mouse, both seen in the above photograph. As you can see, the biggest difference is size. Rats grow to a body of 8 inches and a tail of 9 inches, and a weight of almost a pound.