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Dog Size Calculator

Created by Łucja Zaborowska, MD, PhD candidate
Reviewed by Steven Wooding
Last updated: Jan 18, 2024

The dog size calculator works as a puppy size predictor - it allows you to compute how big your dog will be once it's fully grown-up. 🐶

Have you just adopted a stray puppy? Maybe you got a dog of a mixed-breed? Are you still wondering How big my puppy will get? Search no more - our puppy height and weight calculator is here to help.

Follow the article below for the details of the canine development and growth, dog growth calculator basics, breeds descriptions, and formulas used in our puppy size estimator. 🐕

How much will my dog weight?

Our how big will my puppy get calculator uses the following equation:

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

Why 52?

52 is the number of weeks in a year. That's how we program the dog size predictor to give us your puppy's weight when he is exactly 1 year old.

We used this value in our puppy calculator because, on average, dogs mature into adults within 12 months. This value ranges from 8 months for smaller breeds to around 16 months for larger breeds.

Your dog's weight category

According to your puppy weight calculator's results, we can place your dog into one of 5 major breed size groups:

Toy dog

< 12 lb / < 5.4 kg

Small dog

12 - 22 lb / 5.4 - 10 kg

Medium dog

22 - 57 lb / 10 - 25.9 kg

Large dog

57 - 99 lb / 25.9 - 44.9 kg

Giant dog

>99 lb / >44.9 kg

💡 Small dogs tend to live longer. For every increase of 4.4 pounds (2 kg) of body weight, a dog's lifespan decreases by 1 month. This way, the dog weight predictor serves as a tool for estimating your dog's longevity.

Once you got everything you need from the puppy size calculator, try our other Omni dog tools:

How big will my dog get in inches/centimeters?

Your dog's height depends mostly on its breed. However, you can estimate its maximum possible height from paws to shoulders using our dog weight chart calculator:

Toy dog

Max. 12 in (30.5 cm)

Small dog

Max. 18 in (45.7 cm)

Medium dog

Max. 25 in (63.5 cm)

Large dog

Max. 30 in (76.2 cm)

Giant dog

Max. 44 in (111.8 cm)

🙋 The tallest dog ever measured was a Great Dane of name Zeus. Zeus had an unbelievable 44 in (111.8 cm) of height! (from paw to shoulder)

How to use the dog size calculator?

Our puppy growth calculator just couldn't get any simpler! Prepare your dog's weight in a weight unit of your choice and actual age in weeks or days.

The dog weight estimator will process these details of your puppy to its adult weight. Your results will also be displayed as a range since many factors may influence your dog's growth and final size.

You will also receive the type of breed of your dog:

  • Toy dog - e.g., Yorkshire Terrier, Chihuahua, Prague Ratter
  • Small dog - e.g., Beagle, Dachshund, Corgi
  • Medium dog - e.g., Samoyed, Labrador retriever, American Staffordshire Terrier
  • Large dog - e.g., Alaskan Malamute, Bernese Mountain Dog, Bergamasco
  • Giant dog - e.g., Great Dane, Bullmastiff, Kuvasz

Along with a short description and the maximum height possible.

Satisfied with your puppy weight estimator result? Discover our other animal tools:


How big will my puppy grow if he is 9 lbs at 12 weeks?

Your dog will weigh around 39 lbs (35.1-42.9 lbs). His predicted height is up to 25 in.
You can calculate it with the formula:
Adult weight = (Puppy weight / Puppy age in weeks) × 52.
Adult weight = (9/12) × 52 = 0.75 × 52 = 39lbs.

How do I calculate dog size?

To calculate the future dog size of a puppy:

  1. You need to know their age in weeks.
  2. You need to know their weight (in the most convenient unit).
  3. Now, use the formula:

Adult weight = (Puppy weight / Puppy age in weeks) × 52.
4. You can always double-check with our dog size calculator.

How big is a 30lb dog?

A 30 lb dog is a medium-sized dog. This type of dog typically is up to 25in tall. Examples of medium dog breeds are samoyed, American Staffordshire terrier, and labrador retriever.

What is the size of a dog's brain?

A dog's brain is roughly a size of a small citrus fruit - lemon or tangerine. The dog brain-to-body ratio is 1:125, while in humans, it's about 1:40.

Łucja Zaborowska, MD, PhD candidate
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