Dog Size Calculator
Wondering how big your puppy will get? This calculator estimates your puppy's adult weight using growth curve data for different breed sizes. Enter your puppy's current weight, age, and breed size category, and the calculator will project the expected adult weight and show how far along the growth journey your pup has come.
Puppies grow at different rates depending on their breed size. Toy and small breeds reach adult size much faster (around 9 to 12 months) than giant breeds, which may keep growing until 18 to 24 months old.
Typical growth timelines by breed size:
- Toy breeds (< 10 lbs): Reach adult size by 9 to 12 months
- Small breeds (10-25 lbs): Reach adult size by 10 to 12 months
- Medium breeds (25-50 lbs): Reach adult size by 12 to 15 months
- Large breeds (50-90 lbs): Reach adult size by 14 to 18 months
- Giant breeds (90+ lbs): Reach adult size by 18 to 24 months
The calculator uses published veterinary growth curves that map the percentage of adult weight reached at each age. For example, a large breed puppy at 16 weeks has typically reached about 48% of its adult weight, while a small breed puppy at the same age has already reached about 67%.
Keep in mind that these are estimates. Individual puppies can vary based on genetics, nutrition, whether they were spayed or neutered (which can slightly affect growth plate closure timing), and overall health. Mixed breed dogs are harder to predict because their growth pattern depends on which parent breeds dominate.
For the most accurate prediction, weigh your puppy regularly and compare against breed-specific growth charts from your veterinarian.