PupSize

Puppy weight calculator

How big will your puppy get? Enter their breed, age and current weight to estimate adult size and see a month-by-month growth chart.

Sex
Weigh your puppy on a scale for the most accurate result.

How it works

Dogs of different sizes grow at very different speeds. A Chihuahua is close to adult size by 9 months, while a Great Dane keeps filling out until about 2 years. PupSize uses a growth curve for each size group to work out what share of adult weight your puppy has probably reached, then scales up from today’s weight.

For pure breeds it also shows the typical adult range for that breed and sex, so you can compare. Read the full method.

Breed growth guides

Frequently asked questions

How accurate is a puppy weight calculator?
It gives a reasonable range, not a promise. Accuracy improves as your puppy gets older: an estimate at 6 months is much tighter than one at 8 weeks. Genetics, diet, health and neutering timing all play a part.
When will my puppy stop growing?
Small and toy breeds usually reach adult weight at around 9–12 months. Medium breeds take about 12–15 months, large breeds 15–18 months, and giant breeds up to 2 years.
How do I estimate the size of a mixed-breed puppy?
If you know the parents’ adult weights, enter them: they are the best guide. If not, pick the size group you think fits, and treat the result as a rough range. Paw size is a popular hint but a weak predictor.
My puppy is outside the predicted range. Should I worry?
Not necessarily: some puppies are simply bigger or smaller than average. Check that the age and weight are right. If your puppy seems too thin, too heavy, or growth suddenly stalls, talk to your vet.