Free puppy weight calculator
Puppy Weight Calculator
How big will your puppy get? Enter age, weight and size for a likely adult weight range, how grown your puppy is now and a growth chart to adulthood.
Estimated adult weight
Enter age, weight and size to see your puppy’s estimated adult weight.
Estimate only. Not veterinary advice. Mixed breeds and individual dogs vary, and the size class you pick matters a lot. Ask your vet to check your puppy’s growth and body condition.
Estimated adult weight
–lb
A likely range at about 2 years old, not an exact number.
typical path likely range, from today to 2 years
Expected weight coming up
Estimate only. Not veterinary advice. Mixed breeds and individual dogs vary, and the size class you pick matters a lot. Ask your vet to check your puppy’s growth and body condition.
How to use the puppy weight calculator
- Weigh your puppyUse a kitchen or baby scale for small puppies, or weigh yourself holding the puppy and subtract your own weight.
- Enter the ageIn weeks or months. The curves work from 8 weeks to 2 years.
- Pick the sizeChoose the adult size class, or pick a breed and we set it for you. Results update as you type.
The calculator divides your puppy’s weight by the share of adult weight that puppies of that size usually have at that age. For example, small-breed puppies weigh about 46% of their adult weight at 16 weeks, so a 9 lb small puppy at 16 weeks lands around 17–23 lb as an adult. The growth curves come from published veterinary research; see how it works and the sources.
Puppy size classes
| Size | Adult weight | Typical breeds | Growth finishes |
|---|---|---|---|
| Toy | under 14 lb under 6.5 kg | Chihuahua, Yorkshire Terrier, Pomeranian, Maltese, Toy Poodle, Miniature Pinscher | 9–12 months |
| Small | 14–33 lb 6.5–15 kg | Shih Tzu, Dachshund, Bichon Frise, Miniature Schnauzer, Pug, Beagle, Boston Terrier, Cocker Spaniel | 9–12 months |
| Medium | 33–66 lb 15–30 kg | Australian Shepherd, Siberian Husky, Bulldog, Boxer, pit bull type, Basset Hound | 12–15 months |
| Large | 66–88 lb 30–40 kg | Labrador Retriever, Golden Retriever, German Shepherd Dog | 15–18 months |
| Giant | over 88 lb over 40 kg | Great Dane, Mastiff, Rottweiler, Saint Bernard, Newfoundland | 18–24 months |
Size limits follow the growth standards of Salt et al. (2017). Want the numbers behind the curves? See the puppy growth chart by age and size.
What the result means
The adult weight range is where most puppies with the same size, age and weight end up at about 2 years old. A narrow range means your puppy is already well into its growth. A wide range means it is still young, so many outcomes are possible.
Adult weight reached now is how far along the typical growth curve your puppy is. Most puppies reach about half their adult weight at 3–5 months; giant breeds get there later than toy breeds.
The growth chart shows a typical path from today to 2 years old, with the likely range around it. Puppies grow in spurts, so a few weeks above or below the line are normal.
Mixed breeds, puppies that were ill or underfed, and dogs on the border between two size classes can end up outside the range. Your vet can check your puppy’s growth with a proper body condition score.
Puppy weight FAQ
How accurate is a puppy weight calculator?
It gives a reasonable range, not a promise. Healthy puppies of the same breed and age can differ a lot, so we show an adult weight range instead of one number. Estimates get better as your puppy gets older: at 8–12 weeks the range is wide, and after about 6 months it narrows. Mixed breeds and puppies near the edge of a size class vary the most.
When do puppies stop growing?
Small and toy breeds usually finish most of their growth at about 9–12 months, medium breeds at about 12–15 months, large breeds at about 15–18 months and giant breeds at about 18–24 months. Many dogs, especially small ones, keep filling out a little in their second year. Your vet can tell you when your puppy is ready for adult food.
Which size class should I pick for a mixed-breed puppy?
Pick the class that matches the adult weight you expect. If you know the parents, use the size of the bigger parent. If you have no idea, try two neighbouring classes and compare the ranges. If the calculator says the result is unusual for the class, the other class probably fits better.
Does the "double the weight at 16 weeks" rule work?
For toy and small breeds it is close: the growth curves say about × 2.1–2.2 at 16 weeks. For medium and large breeds it guesses too low (the curves say about × 2.4), and the popular "double the weight at 6 months" rule guesses too high for most dogs (the curves say about × 1.4–1.6). See How it works for the full comparison.
Do big paws mean a big dog?
Only loosely. Paw size gives a rough hint, but it is not a reliable way to predict adult weight. Age, current weight and the expected size of the breed or parents are much better clues.
My puppy seems heavy or light for its age. Should I worry?
Not from a calculator alone. Puppies grow in spurts, and weight alone does not show if a puppy is too fat or too thin. Your vet checks body condition (how the ribs, waist and belly feel and look). Keep growing puppies lean, especially large and giant breeds, and ask your vet before changing food amounts.
Puppy growth chart
Percent of adult weight by age for each size, plus weight charts in pounds and kilos.
How it works
The method, the research behind it, and how popular rules of thumb compare with real growth data.