Puppy Adult Weight Calculator
Current Weight (kg)
Current Age (weeks)
Breed Size
Puppy adult weight prediction estimates final size from current weight and age. The formula differs by expected adult size since large breeds grow for much longer than small breeds.
- 1Small (< 10kg adult): adult ≈ 4× weight at 8 weeks
- 2Medium (10–25kg): adult ≈ 2.5× weight at 8 weeks
- 3Large (25–45kg): adult ≈ 2× weight at 16 weeks
- 4Estimates vary ±20% — genetics and nutrition affect final size
Small breed, 1.5 kg at 8 weeks=Estimated adult weight: ~6 kg
| Adult size | Fully grown by |
|---|---|
| Toy/Small | 9–12 months |
| Medium | 12–15 months |
| Large | 15–18 months |
| Giant | 18–24 months |
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