Updated · Published by Radif Partners

Puppy weight calculator: how big will my puppy get?

Built on the adult weights of 200 breed standards, separately for males and females, rather than on a doubling rule.

AKC, Kennel Club and FCI breed standards · 200 breeds · checked

The most reliable answer to how big a puppy will get is the adult weight range of its breed, for its sex, and for a mixed breed the weights of its two parents. That is what this calculator returns. Pick one of the 200 breeds documented on this site and it gives the adult range the published standards set for males or for females, the middle of that range, and how far along your puppy is today. For a mix, enter the mother's and father's adult weights: puppies almost always finish between the two. We deliberately do not project a single figure from age and current weight with a multiplier. Growth curves published by veterinary nutrition researchers show that dogs of different sizes follow different shapes, plateauing earlier in small breeds and much later in giants, and a one-size rule built on weight at a given number of weeks can be badly off for either end. A breed range tells you honestly how wide the outcome is.

For a purebred only. 200 breeds, weights from the published standards.

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Weigh on the same scale each time.

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For a mix only.

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Ask the breeder or shelter.

55–80 lb
expected adult weight
  • Middle of the range: 68 lb (male Labrador Retriever, breed standard)
  • Share of that weight reached today: 37%
  • About 43 lb still to come to reach the middle of the range.

Runs in your browser: nothing you type is sent or stored. Breed ranges describe populations; an individual puppy can finish outside them. How the figures are built.

How the range is built

Each breed page on this site records the adult weight range given by the major kennel club standards, split by sex where the standards distinguish them. Males are usually heavier: an adult male Labrador Retriever is listed at 55 to 80 lb against 46 to 70 lb for a female. The calculator simply takes the line that matches your puppy.

The share reached today is your puppy's weight divided by the middle of that range. It is a progress indicator, not a verdict: a puppy at 40 percent may be early or late depending on its age and line, and only a run of weigh-ins tells you whether it is following its own curve.

Why we do not use a doubling formula

Popular rules such as doubling the weight at a given age come from averages across very different dogs. Research published in PLoS ONE in 2017, which built growth standard charts from the records of thousands of client-owned dogs, had to separate five adult-size categories precisely because one curve did not fit them all: toy breeds are nearly finished within a year, while the largest keep filling out well into their second.

A formula that is right for a Beagle overshoots a Yorkshire Terrier and undershoots a Great Dane. A range from the breed standard is less impressive than a single number, but it is the honest answer.

Predicting a mixed-breed puppy

A cross inherits size genes from both parents in proportions nobody can fix in advance, and littermates can end up noticeably different. The safest forecast is the band between the two parents' adult weights. If only the mother is known, as is common with rescues, her weight is a floor more often than a ceiling when the father is unknown.

Paw size and loose skin are often quoted as clues; they say little reliable. A vet can give a better read from the growth plates on an X-ray if the question really matters, for instance for a housing weight limit.

Keeping a growing puppy lean

Overfeeding does not make a dog bigger; it makes it heavier, and in large and giant breeds rapid weight gain during growth is linked with joint problems. Feed for the body you see, check the ribs and waist each week, and use the dog food calculator, which applies the Merck puppy energy factors, as a starting point you then adjust.

Weigh at the same time of day on the same scale every two weeks. A steady curve matters more than where it sits in the breed range.

Not a substitute for a veterinarian

A puppy that stops gaining, loses weight or seems unusually thin or heavy for its breed should be seen by a vet. Growth problems in large breeds are easier to correct early than once the growth plates have closed.

Sources

By Radif Partners Updated

Frequently Asked Questions

Use the parents' adult weights when you know them: most puppies finish between the two. With only the mother known, treat her weight as the likely minimum if the father looked larger. A shelter's guess from paws or ears is unreliable; a vet's X-ray of the growth plates gives a better idea for a puppy over a few months old.
It depends on size. Growth charts built from thousands of dogs show small breeds close to adult weight within about a year, while large and giant breeds keep gaining into their second year. That is why this calculator shows the share of adult weight reached rather than projecting from a fixed age.
Usually, but not always. Most breed standards give females a lower range: about 46 to 70 lb against 55 to 80 lb for Labrador males, for instance. The ranges overlap, so a large female can outweigh a small male of the same litter. Select the sex in the calculator to get the right band.
No. Final size is set mainly by genetics. Extra food adds fat, and in large and giant breeds fast weight gain while the skeleton is still growing is associated with orthopedic problems. Aim for a lean puppy with ribs you can feel easily, and adjust portions every couple of weeks as it grows.