Dog Growth Calculator
Estimate your puppy’s adult weight
Current Weight (lbs)
Age in Weeks
Breed Size
How to Predict Your Puppy's Adult Weight
Our dog growth calculator uses your puppy’s current weight and age to estimate their adult size. The most accurate reading is at 16 weeks of age. Results are estimates — genetics, nutrition and individual variation all play a role.
Puppy Growth Chart by Breed Size
| Breed Size | 8 weeks | 16 weeks | Full grown by |
|---|---|---|---|
| Small | 25% adult weight | 50% adult weight | 9-12 months |
| Medium | 20% adult weight | 40-50% | 12-15 months |
| Large | 15% adult weight | 35-40% | 18-24 months |
| Giant | 12% adult weight | 30% | 18-24 months |
FAQs
How big will my puppy get?
The most reliable estimates use weight at 16 weeks. Double your puppy’s weight at 4 months for a rough adult weight estimate (works best for medium breeds). For large and giant breeds, multiply 16-week weight by 2.5. For small breeds, multiply by 2.
When do dogs stop growing?
Small breeds are fully grown by 9-12 months. Medium breeds by 12-15 months. Large breeds take 18-24 months to reach full size. Giant breeds may not reach their full adult weight until 24-30 months.
Conclusion
Use our dog growth calculator to estimate your puppy’s adult weight. For ongoing weight monitoring as they grow, use our dog weight calculator and food calculator to adjust portions by life stage.