Adult females usually reach 500g to 700g (approx. 1lb to 1.5lb) of weight, while adult males 700g to 900g (approx. 1.5lb to 2lb).
A Guinea Pig or cavy usually weighs up to 2 pounds. For more information visit your local pet store or vet on questions with guinea pigs.
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Fully grown female guinea pigs should weigh about one pound, and fully grown male
guinea pigs should weigh about two pounds.
Guinea pigs are varied in weights. It depends on how much you feed it or how little you do. Usually if you feed it well, they should be FAT.
Guinea pigs generally weigh about 2-4 pounds full-grown. They can however become over-weight if they do not eat enough fruits and vegetables.