Dog Size Calculator
Predict your puppy's adult weight based on their current weight and age.
Formula
Adult Weight ≈ (Current Weight ÷ Age in Weeks) × 52
- Most accurate for 10–14 week old puppies.
- Results are estimates — breed, genetics, and nutrition all play a role.
- Giant breeds (Great Dane, etc.) continue growing until 18–24 months.
10 lb puppy at 10 weeks
Inputs
- Current Weight: 10 lbs
- Current Age: 10 weeks
(10 ÷ 10) × 52 = 52 lbs → Large size category.
Frequently asked questions
How accurate is this formula?
It gives a rough estimate. Breed standards are more reliable if you know the breed.
Does the formula work for giant breeds?
Giant breeds grow more slowly — this formula may underestimate their adult size.