Data-driven estimates
Uses published canine growth research and curated adult breed ranges.
Puppy Weight Calculator
Estimate how big your puppy may get as an adult.
Enter your puppy's details to see an adult weight range, growth chart, and confidence level.
How it works
Enter your puppy's age, weight, and breed to compare the current measurement with a size-based growth curve and an adult reference range.
US-focused
Pound-first inputs and common US breed names.
Always free
No sign-up, no limits. Just helpful tools.
Puppy Growth Chart by Size
Different size categories grow at different rates. Here's what to expect.
Toy
- Adult weight
- Under 12 lb
- Full growth
- 9–10 months
Small
- Adult weight
- 12–25 lb
- Full growth
- 10–12 months
Medium
- Adult weight
- 25–50 lb
- Full growth
- 12–15 months
Large
- Adult weight
- 50–100 lb
- Full growth
- 14–18 months
Giant
- Adult weight
- Over 100 lb
- Full growth
- 18–24 months
Not sure about your puppy's size? Try the mixed breed calculator.
Have a Mixed Breed Puppy?
Mixed breed puppies can be harder to predict, but our calculator uses parent weights, current size, and growth patterns to estimate your mixed breed puppy's adult weight.
Try the Mixed Breed CalculatorPopular puppy growth charts
Compare estimated weight by age for breeds puppy owners are searching for now.
Puppy Weight Chart by Breed
Choose a breed to see typical adult weight ranges, growth stages, and puppy weight estimates by age.
Frequently asked questions
How accurate is the puppy weight calculator?
Our calculator provides estimated weight ranges based on breed data and growth curves. Individual puppies may vary based on genetics, nutrition, and health. Use the result as a helpful guide, not a guarantee.
At what age is a puppy fully grown?
Toy breeds (under 12 lb) typically finish growing around 9–10 months. Small to medium breeds reach adult weight by 12–15 months. Large and giant breeds may continue growing until 18–24 months.
How does the calculator work for mixed breed puppies?
For mixed breeds, you can enter parent weights for a better estimate or select an expected adult size category. The calculator uses size-based growth curves when breed-specific data isn't available.
Why does the calculator show a weight range instead of an exact number?
No prediction can be exact. Showing a range is more honest and accounts for natural variation in genetics, diet, exercise, and individual growth patterns.
Should I be concerned if my puppy is outside the estimated range?
Slight variations are normal. If your puppy is significantly above or below the range, or if their growth rate changes suddenly, consult your veterinarian. This calculator is not a substitute for professional advice.