Puppy Weight Calculator
Predict your puppy's adult weight from its current age and weight, adjusted for breed size.
Small breeds finish growing by about a year; large breeds keep filling out to 18 months or more. This is a ballpark from typical growth curves, not a promise — parents' size is the best hint.
How it works
Puppies grow at different rates depending on how big they will end up. Small breeds finish growing within months, while giant breeds keep filling out for well over a year, so age is central to any prediction.
The tool takes your puppy's current age and weight and projects forward using the typical growth curve for its size category, landing on an estimated adult weight.
It is a forecast, not a promise. Genetics, nutrition, and neutering all nudge the final size, so use the number to choose the right crate or food rather than as a guarantee.
Frequently asked questions
How accurate is a puppy weight prediction?
It is a reasonable estimate, usually within a margin. Growth depends on genetics and nutrition, so consider the parents' sizes as the best extra clue.
When do puppies stop growing?
Small breeds are often done by 8 to 10 months, medium breeds around a year, and large or giant breeds can keep growing until 18 to 24 months.
Does breed size really change the math?
Yes. A toy breed and a mastiff at the same age are at very different points on their growth curves, so the size category strongly shapes the prediction.