Pets · Puppy growth
Puppy Weight Calculator
Wondering how big your puppy will get? Enter their age and current weight and get an estimated adult weight, adjusted for breed size.
- Breed-size adjusted
- Shows a range
- Growth chart included
Puppy Weight Calculator
Please enter a valid age (4–52 weeks) and weight.
- Likely range
- –
- Weight in pounds
- –
How the estimate works
Puppies grow fastest in the first months and slow down as they approach adult size. The calculator projects current weight forward to 52 weeks and applies a breed-size adjustment, because toy breeds finish growing much earlier than giant breeds. The result is a rough estimate with a ±15% range — genetics, diet and neutering all shift the final number.
Typical growth by breed size
| Breed size | Adult weight | Stops growing at |
|---|---|---|
| Toy | under 5 kg | 8–10 months |
| Small | 5–10 kg | 10–12 months |
| Medium | 10–25 kg | 12–15 months |
| Large | 25–45 kg | 15–18 months |
| Giant | over 45 kg | 18–24 months |
Getting the most accurate reading
Weigh your puppy at the same time of day on the same scales. The estimate is most reliable between 8 and 24 weeks — before 8 weeks growth is too uneven, and after 6 months most of the growing is done so the current weight is already close to the answer. For mixed breeds, pick the size closest to the parents.
Related guides and tools
Puppy Weight Calculator FAQs
How accurate is a puppy weight calculator?
It is a rough guide, not a guarantee. Most estimates land within about 15% of the true adult weight when used between 8 and 24 weeks, but genetics and diet can move the final figure.
When do puppies stop growing?
Toy and small breeds finish around 8–12 months, medium breeds around 12–15 months, large breeds 15–18 months, and giant breeds can keep filling out until 18–24 months.
Does neutering affect adult size?
Neutering before growth plates close can add a little extra height, because sex hormones signal the plates to close. The effect is small — usually a few percent — but worth knowing.
My puppy is overweight — does that change the estimate?
Yes. The calculator assumes a healthy weight. An overweight puppy will give an inflated estimate, so use your vet's ideal-weight figure if your puppy is carrying extra.
Which is more reliable: weight formula or paw size?
Weight-based formulas beat paw size. Big paws hint at a big dog, but the correlation is weak — current weight at a known age is a much better predictor.