Puppy Weight Calculator
Estimate your puppy's adult weight based on their current age and weight. Uses breed-size-adjusted formulas for 2026.
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Enter puppy details
How It Works
This calculator uses the growth-rate formula: it takes your puppy's current weight, divides by their age in weeks, then projects to 52 weeks (1 year). A size-category multiplier adjusts for the fact that larger breeds continue growing well past their first birthday.
For Best Results
Use this calculator when your puppy is between 12 and 20 weeks old for the most accurate estimate. Very young puppies (under 8 weeks) or older puppies (over 6 months) may give less accurate results.
| Small breeds | Reach adult weight by 10–12 months |
| Medium breeds | Reach adult weight by 12–15 months |
| Large breeds | Reach adult weight by 15–18 months |
| Giant breeds | Reach adult weight by 18–24 months |
Frequently Asked Questions
This calculator provides an estimate based on growth rate formulas. Accuracy is best when used between 12-20 weeks of age. Individual genetics, diet, and health can cause actual adult weight to vary.
The most accurate estimates come from puppies between 12-20 weeks old. Very young puppies (under 8 weeks) or older dogs (over 6 months) may give less reliable predictions.
Yes, male dogs are typically 10-15% heavier than females of the same breed at maturity. Our calculator provides an average estimate — males may be slightly above and females slightly below.