How the puppy weight calculator works
Puppies reach a predictable percentage of their adult weight at each stage of growth, and that curve depends on breed size. PawWise divides your puppy's current weight by the percentage of adult weight typical for its age and size, producing an estimated adult weight. For example, a medium-breed puppy is usually about two-thirds grown by 6 months.
When do puppies stop growing?
| Breed size | Finishes growing |
|---|---|
| Small (<20 lb) | 10–12 months |
| Medium (20–50 lb) | ~12 months |
| Large (50–90 lb) | 15–18 months |
| Giant (90 lb+) | 18–24 months |
Other clues to adult size
- Parents' size — the single best predictor for purebreds.
- Paw size — oversized paws often signal more growth to come.
- Breed standard — look up the typical adult range for the breed.
- DNA test — for mixed breeds, a test can reveal the breed mix and likely size.
Frequently asked questions
How accurate is a puppy weight prediction?
For purebreds it's usually within about 10–15%. Mixed breeds are harder to predict because they may inherit traits from differently sized parents.
My puppy is a mixed breed — which size do I pick?
Estimate from the parents if known, or pick the size that matches the larger parent to avoid underestimating.
Should I free-feed my growing puppy?
No. Use measured meals — see our dog food calculator — to support steady growth without excess weight that can stress developing joints.
Related: dog food calculator · dog age calculator.