Dog Size Calculator
Predict your puppy's adult size and weight using scientific growth formulas
Puppy Size Predictor
Enter your puppy's current age in weeks or days
Enter your puppy's current weight in pounds or kilograms
Adult Size Prediction
Enter puppy age and weight to predict adult size
📐 Calculation Formula
Adult Weight = (Puppy Weight ÷ Puppy Age in Weeks) × 52
This formula estimates adult weight based on current growth rate, assuming dogs reach maturity around 1 year (52 weeks). Results may vary based on breed, genetics, nutrition, and health factors.
Example Calculation
Puppy Growth Scenario
Puppy: 9 lbs at 12 weeks old
Calculation: (9 ÷ 12) × 52 = 39 lbs
Range: 35.1 - 42.9 lbs (±10%)
Category: Medium Dog (22-57 lbs)
Prediction Details
Maximum height: Up to 25 inches
Size category: Medium Dog
Breed examples: Labrador Retriever, Border Collie
Estimated lifespan: ~11-13 years
Dog Size Categories
Toy Dog
< 12 lbs (< 5.4 kg)
Max: 12 in (30.5 cm)
Small Dog
12-22 lbs (5.4-10 kg)
Max: 18 in (45.7 cm)
Medium Dog
22-57 lbs (10-25.9 kg)
Max: 25 in (63.5 cm)
Large Dog
57-99 lbs (25.9-44.9 kg)
Max: 30 in (76.2 cm)
Giant Dog
> 99 lbs (> 44.9 kg)
Max: 44 in (111.8 cm)
Puppy Growth Tips
Provide age-appropriate nutrition
Monitor weight regularly
Adjust exercise to age and size
Regular veterinary check-ups
Consider genetic factors
Plan for adult size needs
Understanding Puppy Growth and Size Prediction
Growth Formula Science
Our calculator uses the scientifically-based formula: Adult Weight = (Puppy Weight ÷ Age in Weeks) × 52. This assumes dogs reach maturity around 1 year (52 weeks), though this varies by breed.
Factors Affecting Size
- •Genetics: Parent size is the strongest predictor
- •Nutrition: Proper feeding affects growth rate
- •Health: Medical conditions can impact development
- •Breed: Different breeds mature at different rates
Maturation Timeline
Toy Breeds
Mature by 8-10 months
Small-Medium Breeds
Mature by 10-12 months
Large Breeds
Mature by 12-18 months
Giant Breeds
Mature by 18-24 months
Note: This calculator provides estimates. For mixed breeds or specific health concerns, consult your veterinarian for personalized guidance.