How big will your puppy get?
A quick, vet-grade estimate using breed averages and published growth curves. Tell us a few things about your pup and we’ll give you an adult weight range.
Estimate adult size
Works best for dogs. Scroll down for a note on cats.
How this works
Breed sets the size category
Your breed selection maps to one of five size categories (toy, small, medium, large, giant). Each category has its own published growth curve from veterinary nutrition textbooks.
Age + weight projects forward
Puppies hit specific percentages of adult weight at specific ages. We divide your pup’s current weight by the expected % for their age to project where they’ll land.
We blend both signals
For known breeds, we also factor in the breed’s typical adult range as a sanity check. The result is a range — not a single number — because real puppies vary.
🐱 What about cats?
Most cats land between 8 and 12 pounds as adults, regardless of breed, and are usually full-grown by 12 months. The variability is small, so a calculator doesn’t add much.
The big exceptions are a few larger breeds: Maine Coons (12–20 lb, grow until 4 years), Ragdolls (10–20 lb), Norwegian Forest Cats (12–18 lb), and Savannahs (15–25 lb).