Blog · Puppy growth
How Big Will My Puppy Get?
Three practical ways to predict your puppy's adult weight: the weight-formula method, the 16-week doubling rule, and breed growth charts.
Published 2026-10-13 · Try the Puppy Weight Calculator
Method 1: the weight formula
The quickest estimate: adult weight ≈ (current weight ÷ age in weeks) × 52, adjusted for breed size. A 12-week-old, 5.5 kg medium-breed puppy: (5.5 ÷ 12) × 52 × 0.86 ≈ 20.5 kg. Try it in our puppy weight calculator — it applies the breed-size adjustment and shows a range automatically.
Method 2: double the 16-week weight
For medium and large breeds, doubling the weight at 16 weeks gives a decent adult estimate. A Labrador at 14 kg at 16 weeks will likely land near 28 kg. It works less well for toy breeds (they mature earlier) and giant breeds (they grow longer).
Method 3: breed growth charts
If you know the breed, compare against published growth charts — breed clubs and vets publish weight-by-age tables. For mixed breeds, use the chart for the breed the puppy most resembles, or the size category of the parents. Our puppy growth chart by breed size gives typical ranges.
Why estimates vary
Genetics dominate, but diet, neutering age and health shift the outcome. An overweight puppy inflates every formula — use the vet's ideal weight, not the scale weight, if your puppy is carrying extra. And remember: these are guides for planning (crate size, food budget, car space), not guarantees.
Try the calculator
Guides explain the rules; the tool does the maths. Puppy Weight Calculator gives you an instant, personalised answer.
FAQs
Can you tell adult size from paw size?
Roughly, but weakly. Big paws hint at a big dog, but the correlation is poor compared with weight-at-age formulas.
Do male puppies grow bigger than females?
Usually, yes — males of most breeds end up 5–15% heavier than females, though individual variation is large.
At what age is the estimate most accurate?
Between 8 and 24 weeks. Before 8 weeks growth is uneven; after 6 months the current weight is already most of the answer.