Enter your puppy's age and weight to estimate their full-grown weight and when they'll stop growing.
lb
weeks
Months × 4.3 = weeks (3 months ≈ 13 weeks)
Examples: toy = Chihuahua, Yorkie · small = Shih Tzu, Dachshund · medium = Beagle, Border Collie · large = Lab, Golden, German Shepherd · giant = Great Dane, Mastiff
Please enter a weight and an age between 8 and 104 weeks.
Puppies don't grow in a straight line. They pile on weight fast in the first few months, then slow down as they get close to adult size. Small dogs finish quickly, often by their first birthday, while giant breeds can keep growing until age 2.
The calculator compares your puppy's weight with a typical growth curve for its size group. For example, a medium-size puppy at 16 weeks usually weighs about 44% of its adult weight, so a 15 lb puppy at that age would be on track for about 34 lb. The result is shown as a range, because genes, diet and mixed breeding all make a difference.
Picked Not sure? The calculator tries each size group and picks the one whose adult weight matches your puppy's numbers.
Puppy growth chart by size
Typical share of adult weight reached at each age. Use it to see roughly where your puppy is on the curve.
Age
Toy
Small
Medium
Large
Giant
Quick rules of thumb
Toy and small breeds: roughly double the weight at 14 weeks. Most are close to full size by 9 to 10 months.
Medium breeds: about 2 to 2.5 times the weight at 16 weeks. Most stop growing between 12 and 15 months.
Large and giant breeds: a bit under double the weight at 6 months for large breeds, and about double for giants. They grow for 15 to 24 months, and vets often recommend large-breed puppy food so they grow at a steady, healthy pace.
Mixed breeds: the parents' size is your best clue. If you don't know the parents, a vet visit or a dog DNA test can narrow down the size range.
Common questions
How can I tell how big my puppy will get?
The best clues are your puppy's breed or mix, the size of the parents, and how much your puppy weighs at a known age. Puppies in the same size group grow along a similar curve, so their current weight and age give a reasonable estimate. A vet can refine it.
At what age is a puppy half its adult weight?
Roughly 3 to 4 months for toy and small breeds, about 4 to 5 months for medium breeds, around 5 months for large breeds and 6 months or later for giant breeds.
When do puppies stop growing?
Toy and small dogs usually reach adult weight around 9 to 12 months, medium dogs around 12 to 15 months, large dogs around 15 to 18 months and giant breeds anywhere from 18 to 24 months. Many keep filling out with muscle for a few months after that.
Do big paws mean a big dog?
Not reliably. Paws often grow ahead of the rest of the body, so they're a loose hint at best. Breed, parent size and weight for age are much better guides.
How accurate is a puppy weight calculator?
It's an estimate. Most puppies end up within about 10 to 15 percent of the projected weight, but genetics, diet, spay or neuter timing and mixed breeding can all shift the result. Estimates get more accurate as your puppy gets older, so try it again in a month.