Puppy Weight Predictor
Predict your puppy's adult weight based on breed, current weight, and age. Uses breed-specific growth curves to estimate final size — works for purebreds and mixed breeds.
Calculate
Puppy weight predictor
Minimum 2 months
This calculator provides estimates based on established veterinary formulas. Every dog is different — use results as a starting point and consult your veterinarian for personalized advice.
How to use
- 1
Select breed or size category
Choose your puppy's breed from the dropdown. For mixed breeds, select the closest size category or enter both parent breeds if known.
- 2
Enter current weight
Weigh your puppy and enter the current weight in pounds or kilograms. For the most accurate prediction, weigh your puppy in the morning before feeding.
- 3
Enter current age
Enter your puppy's age in weeks or months. The younger the puppy, the wider the prediction range — after 4 months, estimates become significantly more accurate.
- 4
View the prediction
The calculator shows the estimated adult weight range, expected growth remaining, and approximate age when your puppy will reach full size.
- 5
Track over time
Re-enter your puppy's weight every 2–4 weeks to refine the prediction. The estimate becomes more accurate as your puppy grows and the growth curve narrows.
Puppy Weight Predictor FAQ
- For purebred puppies, the predictor is typically accurate within 10–15% of adult weight because breed growth curves are well-documented. Mixed breeds are less predictable — the estimate uses the average of the parent breeds' expected weights if known, or a general growth curve based on current weight and age. Factors like nutrition, health, and whether the puppy was the runt can shift the final weight. The predictor is most accurate after 4 months of age, when growth patterns are more established.
- Small breeds (under 20 lbs adult weight) typically reach full size by 10–12 months. Medium breeds finish growing around 12–14 months. Large breeds continue growing until 14–18 months. Giant breeds like Great Danes and Mastiffs may not reach full size until 18–24 months. Note that dogs reach their adult height before their adult weight — they fill out for several months after reaching full height.
- At any age, you should be able to feel (but not see) your puppy's ribs with light pressure. From above, there should be a visible waist behind the ribs. From the side, the belly should tuck up slightly. If ribs are visible, the puppy may be underweight. If you can't feel ribs at all, the puppy may be overweight. Overweight puppies are at risk for joint problems, especially in large and giant breeds where rapid growth stresses developing bones.
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