From The Tip of The Nose to The Tip Of The Tail
Rat Sizes 11/20/2010
 
Pet rats vary in size,
but the average size is 14 inches including the tail
so I measured Emimy,she is 14 1/2 inches,
so if you the ones from the middle cage it should get to be around Emimy's size,
the large ones will get to be about 18" and the small ones will be about 12"
Anya is 12" so the smaller ones will be about her size. She is still a baby so she'll get a little bigger, about Emimy's size
Also, males tend to get larger than females

Picture