How to Estimate a Puppy's Adult Weight

How to Estimate a Puppy's Adult Weight

Knowing the estimated adult weight of your adorable fur ball can prove to be really helpful. There's no specific formula for calculating the exact adult weight of your pup, but you can always get a rough idea of how big your puppy will get when it grows up. Check out the puppy weight calculator in this DogAppy article for figuring out an estimated weight.
DogAppy Staff
Did You Know?
Studies show that approximately 40% of the dogs in the US are overweight or obese. However, only 17% of the owners consider them as overweight or obese.
All puppies grow at different rates depending on the breed and age. Almost every owner of a cute fur ball wonders as to how big will his/her pup grow up to be, or how much will it weigh after it gains its full size. Well, if you bought a purebred puppy, then no marks for guessing―it will end up being as big or small as its parents. However, it can get a bit complicated if you own a mixed breed. You might need help from your pup's vet in such a case.

Puppies usually grow to their full size in about one year. However, it may vary a bit from breed to breed. The larger breeds keep growing until two years of age. Estimating your dog's weight and size will help you prepare a suitable atmosphere for them, and also know if it will be comfortable and happy in the environment that you provide. There are no specific guarantees about the adult weight of a puppy. We can only get approximate figures so that you get a tentative idea of its weight. The height and weight of a puppy are dependent on a number of factors like diet, health, and obviously genetics. Read further to know how to estimate the fully grown weight of a puppy.

How to Determine a Puppy's Weight When Fully Grown?

By now, you must have known that purebred pups will probably be around the same size as that of its parents. Determining their weight is a simple task, but you might have a tough time determining the weight of your mixed breed. If you don't know about the parent breeds of the puppy, consult a vet. There are a number of factors that are responsible for the growth of a puppy. Usually, a pup will weigh between ⅔ - ¾ of its adult weight at around 24 weeks of its age.

Like Parents, Like Puppies
The best way to predict the size of the puppy is to check the size of the parent breeds. Their sizes, weight, and breeds will give you an idea of how big your puppy will grow up to be. Large dogs will produce large offspring; likewise, small breeds will produce small offspring. The size of the mother of the puppy will give you the best idea about the adult size of your puppy. For instance, if you have a mixed breed of Labrador and Beagle, the puppy cannot weigh more than the Labrador and lesser than a Beagle does.

Size Does Matter
The paw size of the puppies are a reliable factor to judge the size that the puppy will reach. Larger breeds will have larger paws to support the height and weight. The skin is also a determining factor when it comes to guessing its weight in adulthood. The looser the skin of the puppy, the more it can grow.

Determine the age of your pooch in weeks, and find out its current weight. For better results, it is better to estimate the weight according to their breed-size and ages.
  • For small-breed puppies, take their weight at 12 weeks of age.
  • For medium-breed puppies, take their weight at 16 weeks of age.
  • For large-breed puppies, take their weight at 20 weeks of age.
The formula to calculate your puppy's approximate adult weight is simple.

Method I

Growth = Current weight in lb./Age in weeks

Adult Weight = Growth x 52

Let's say, you have a Cocker Spaniel puppy that is 16 weeks old and weighs 12 lb. Divide the current weight, i.e., 12 by 16. It gives 0.75, which is the growth rate of the puppy. It means that your puppy will grow 0.75 lb. per week. Now, multiply the growth rate by 52, which is the number of weeks in one year. Most of the dogs reach up to their full size and weight in a year. Most of you might not be liking math, which is where the Puppy Weight Calculator will come in handy. You won't need a calculator to sit and do all the calculations. Simply put your puppy's weight and age in weeks and click on "Adult Weight" to get the result.

Puppy Weight Calculator
Growth = 0.00 lb./week
Adult Weight = 0.00 lb.

That was easy, wasn't it? You can always make a note of it or check back later again to very the weight when your puppy grows up to be an adult dog. Since these are just approximate calculations, won't it be better to look at other ways too?

Method II
  • For toy-small breeds: Adult weight = weight at 6 weeks x 4
  • For medium-large breeds: Adult weight = weight at 14 weeks x 2.5
  • For large-giant breeds: Adult weight = weight at 16 weeks x 2
Method III
  • Take the weight when your puppy is 6, 14, or 24 weeks for small, medium, and large (giant) breeds, respectively. If you have a small breed, double the weight of the puppy, and then double the resultant weight. For example, if your puppy weighs 4 lb., double it to get 8 lb., and then double the resultant 8 lb. to get 16 lb. This is what your puppy will weigh in adulthood.
  • For medium puppies, weigh it at 14 weeks. Multiply the weight by 2. Then, the total by the half of the weight at 14 weeks. For example, if your pup weighs 20 pounds in 14 weeks, multiply it by 2 to get 40. Now, add the half of 20 i.e., 10 to 40. Your puppy will weigh around 50 lb. when fully grown.
  • For larger or giant breeds, take the weight of the puppy when it is 6 months old. Double the weight is what your puppy's adult weight will be.

Although the results aren't guaranteed, these can be really helpful in getting a look at the future weight and size of your puppy. So, make sure you keep your dog healthy, and not let it gain weight more than the stipulated range. Take your puppy pal for regular walks, engage in playing, and feed nutritive food for its better health.
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