Free breeder tool
Puppy adult weight estimator
A rough projection from today's weight and age. The range is honest about how rough.
Current weight (lb)
Age (weeks)
Expected adult size class
Toy
Small
Medium
Large
Giant
Enter the puppy's weight and age to see an estimate.
How the estimate works
Puppies of different adult sizes grow on different curves: a toy breed has done most of its growing by four months, a giant breed less than half. The calculator picks the rule of thumb that matches the age and size class and reports a range rather than a single number. Breed-specific growth charts and the parents' adult weights are better predictors when you have them.
How accurate is a puppy weight calculator?
It is an estimate with a wide range, especially under 8 weeks. Parent weights and breed growth charts are better predictors. Use it as a sanity check, not a promise to families.
How do you estimate a puppy's adult weight?
Common rules of thumb: under 12 weeks, divide current weight by age in weeks and multiply by 52; at 16 weeks small breeds are about two-thirds grown and large breeds about half; after 20 weeks multiply by a remaining-growth factor for the size class.
When do puppies stop growing?
Toy and small breeds are close to adult size by 8–10 months; medium by 12 months; large by 12–18 months; giant breeds keep filling out to 2–3 years.
BreedBloom does this automatically for every litter: due-date window, ultrasound and X-ray reminders, temperature checks, and per-puppy weight curves.
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