Puppy Weight Calculator

This puppy growth calculator uses a simple growth curve estimate based on breed size. For most medium and large puppies, we project adult weight by scaling the current weight across a 52-week growth period. For toy and small breeds, the calculator adjusts for earlier maturity since these puppies often reach full size before 10 months.

Giant breeds grow on a longer timeline, so our estimator applies a gentler growth curve. That means the estimated adult size is more realistic for breeds that continue filling out into their second year.

AKC Puppy Weight Standards vs. Growth Estimator Formulas

• Toy breeds: Typically reach adult size by 8 to 10 months and stay under 12 lbs when mature.
• Small breeds: Often finish growing between 9 and 12 months, ending around 12–25 lbs.
• Medium breeds: Grow steadily over the first year and usually finish between 25–50 lbs.
• Large breeds: Can reach adult size between 12–18 months and usually weight 50–100 lbs.
• Giant breeds: May continue developing until 18–24 months, typically topping out above 100 lbs.

Tracking your puppy’s growth with a puppy size calculator or puppy size estimator is a smart part of responsible ownership. Regular weigh-ins help you spot plateaus or rapid changes early, so you can adjust feeding, exercise, and vet visits appropriately.

Use this tool as a guide, but always consult your veterinarian if your puppy’s growth stalls, if they seem underweight, or if their energy level changes. A vet can verify whether your puppy is following healthy breed-specific milestones and recommend the best nutrition plan.