Woman sitting on bench in park with dogs of varying sizes.

Puppy Weight Calculator: How Big Will My Puppy Be?

There are very few things more exciting than bringing home a new puppy. You have a new best friend who you get to spend all your time with and who gets to grow alongside you. When you first bring home a puppy, it’s hard to imagine them as anything other than your new little furry friend. But, your puppy won’t stay so small forever. So before you get a dog, you should think about just how big they’ll get.

Knowing how big your puppy will get can help you better prepare for a life with them. For example, if you live in a small studio apartment and don’t plan on moving to a bigger place anytime soon, a big dog may not be the best fit. Puppies won’t stay small for long, and before you know it, they’ll be needing more of everything: more space, more food, even more playtime. Knowing how big your dog will get can also save you some money when it comes to getting a crate and a dog bed, so you don’t have to keep buying them as they grow. 

One way you can determine how big your puppy will be is with a puppy weight calculator. A puppy weight calculator will tell you how much your puppy will weigh depending on various factors, such as their breed, sex, current weight, and age. Using a puppy adult weight calculator is very beneficial so you can have an idea of what you’re in for as your dog gets older.

In this blog post, we’ll be going over some of the factors that impact how big your puppy will be, the different categories for dogs, how to use a puppy weight calculator, and more. To learn more about why using a puppy calculator for weight is important, continue reading the post or use the links below to skip to a section of your choice.

How Big Will My Puppy Be?

The adult size of your puppy ultimately depends on various factors, some of which are genetics, and some of which are environmental. But for the most part, the size of your puppy will depend on the following:

  • Breed: If you know your dog’s breed, then you should be able to get a pretty good idea of how big they’ll be. For mixed-breed dogs, it might be harder to know exactly how big they’ll get, but you can still get some sort of an idea based on their breeds.
  • Genetics: If you know how big your dog’s parents were, there’s a good chance your puppy will grow to around the same size. However, it’s not impossible for a larger-sized parent to produce a smaller-sized dog, which is just something to be aware of.
  • Sex: Generally, male dogs tend to be slightly bigger and taller than female dogs.
  • Spaying/neutering: Whether or not you spay/neuter your dog can have an impact on their weight. Spaying/neutering a dog can make them more likely to end up overweight if they’re not on an appropriate diet and exercise plan. This is because the reduction of sex hormones makes their energy go down, so they’re less efficient at burning calories. You don’t have to change your dog’s diet drastically when you spay/neuter them, but it’s something to be aware of as your dog gets older.
  • Diet and exercise: Just like humans, diet and exercise can play a big role in your dog’s weight. Puppies will need to be fed specific food that is formulated to meet their growing needs. If you have a larger breed dog, you’ll also want to get them specific food for their size. It’s crucial that your puppy meets their nutritional needs so that they can properly grow and thrive. But once your dog is around 6 to 12 months old, you can stop feeding them puppy food and slowly transition to adult food. And at this point, it’s important to make sure you don’t overfeed your dog. Overfeeding your dog and not having them exercise enough can lead to obesity and health issues such as diabetes, regardless of genetics. Feed your dog an adequate amount, take them on walks, play with them often, and coordinate with your vet to ensure that they maintain a healthy weight. 

Weight Categories

There are 5 different weight categories that your dog can fall into, which include the following: 

  • X-Small dog breeds: This includes breeds like Chihuahuas and Toy Poodles, and they will generally be under 12 pounds.
  • Small dog breeds: This includes breeds like French Bulldogs and Pugs, and they will typically weigh around between 12-22 pounds.
  • Medium dog breeds: This includes breeds like Border collies and Siberian Huskies, and they will weigh between 22-57 pounds. 
  • Large dog breeds: This includes breeds like Doberman pinschers and Akitas, and they will weigh between 57-99 pounds.
  • Giant dog breeds: This includes breeds like Great Danes and Saint Bernards, and they will generally weigh over 99 pounds.

In addition to the weight of your dog, it’s also important to be aware of how tall your dog will be in inches. Just like the 5 weight categories, a dog will also fall into one of the following 5 height categories:

  • Toy dog breeds: Toy dog breeds will be a maximum of 12 inches tall.
  • Small dog breeds: Small dog breeds will be a maximum of 18 inches tall.
  • Medium dog breeds: Medium dog breeds will be a maximum of 25 inches tall.
  • Large dog breeds: Large dog breeds will be a maximum of 30 inches tall.
  • Giant dog breeds: Giant dog breeds will be a maximum of 44 inches tall.

How To Use Our Puppy Weight Calculator

Using our puppy weight calculator is simple. To calculate your puppy’s adult weight using our calculator, you just have to follow the following steps:

  1. Insert your puppy’s age in weeks, days, or months
  2. Insert your puppy’s current weight in pounds or kilograms
  3. Click calculate

Just follow those 3 steps and our puppy weight calculator will approximate the weight category that your dog should fall into and what size dog they will be. 

Our puppy weight calculator follows a simple formula:

Adult weight = (Puppy weight / Puppy age in weeks) * 52

The formula uses the number 52 because there are 52 weeks in a year, and generally, a dog will mature into an adult by the time they are one year old. However, this can vary depending on the size of your dog. Smaller dog breeds can reach their full size by the time they are 8 months old, while it can take large dog breeds up to 16 months.

You can also use a puppy weight calculator by breed or sex to determine how much your dog will weigh as an adult, but our calculator just requires the puppy’s current weight and age in weeks. 

Puppy Weight Calculator: FAQs

How can I estimate my puppy’s full-grown weight?

You can estimate your puppy’s full-grown weight by using our puppy weight calculator, which follows the simple formula: Adult weight = (Puppy weight / Puppy age in weeks) * 52.

How much will my puppy weigh when they’re full grown?

How much your puppy will weigh when they’re full-grown varies depending on several factors, such as their breed, gender, and genetics. A dog’s weight when they are full-grown can also fluctuate due to various environmental factors, like whether or not they were neutered or spayed and what their diet and exercise regimen looks like. 

What is the average weight of a 12-week-old puppy?

There is no definite way to determine the average weight of a 12-week-old puppy since different dog breeds weigh different amounts. For instance, the average weight of small dog breeds is under 12 pounds, but for giant dog breeds, it can be over 100 pounds. You can refer to the weight categories section above to see if your dog weighs the average amount for their breed. 

Can you tell how big a puppy will be by its paws?

The size of a puppy’s paw is not a concrete way to determine how big they’ll be, but it can be one indication of their size, especially if they have abnormally large paws. For example, if your puppy’s paws look way too big for their body, that most likely means they have a good amount of growing left to do. 

When will my puppy stop growing?

The amount of time it takes for a puppy to grow to their full size depends on what breed of dog they are and how big they’ll get. Small dog breeds typically stop growing by the time they’re 6 to 8 months, but it can take large dog breeds anywhere from 12 to 18 months to reach their full size. Genetic differences and nutrition can also impact how long it takes for your puppy to stop growing.

Final Notes

It’s important to be aware of how big your puppy will get so that you can prepare for their growing needs. A bigger dog will need more food and space than a small dog, so you need to be sure that you can accommodate that with your lifestyle. Having a dog is a big responsibility, and you need to care for them properly and ensure they meet their nutritional needs so they can be happy and healthy. 

And if your dog is ever sick, it’s also your responsibility to bring them to the vet, which you can do with Dutch.com. Dutch is an online pet telehealth service that helps connect pet owners with licensed veterinarians. With Dutch, you can get all your pet health issues and questions answered right from home. To get started, you just have to provide us with a few details about your pet’s situation, and we’ll set up a video call time with one of our licensed vets who will work with you to create a customized treatment plan that works for your furry friend.

You can also reconnect with your vet at any time if you have any questions or concerns. Our vets respond within 24 hours, so we promise to not keep you waiting and worrying about the state of your pet. Once we create a treatment plan that works for your pup, we’ll ship it directly to you, so you can get to treating them as quickly as possible.