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How Big Do Cats Get? [The Definitive Size Guide]

Ever wondered just how large that adorable kitten might grow?

Cats, with their vast array of breeds and patterns, come in a delightful mix of sizes and appearances.

Whether you’re pondering the petite stature of a Munchkin or the majestic growth of a Maine Coon, understanding a cat’s eventual size is crucial.

So today, we delve into the world of feline growth, offering insights into breed specifics, typical sizes, and the journey to maturity.

So, if you’re contemplating welcoming a whiskered friend into your home, this comprehensive guide will ensure you know precisely what to expect in terms of size.

How Big Do Cats Get?

Cats vary in size by breed, but on average, they range from 5 to 20 inches in height, 5 to 16 pounds in weight. Smaller breeds like Munchkin cats can be as small as 5 inches and 5 pounds, while larger breeds like Maine Coons can reach 20 inches and 16 pounds.

Factors That Influence A Cats Size


Different breeds have distinct standard sizes.

For instance, the Munchkin cat, known for its short legs, is naturally smaller than many other breeds.

On the other end of the spectrum, the Savannah cat, a hybrid between a serval and a domestic cat, can be much larger, especially in earlier filial generations.


Within a breed, genetics plays a crucial role. Just as in humans, a cat may inherit genes from its ancestors that determine its size.

A lineage known for larger or smaller individuals can pass those traits down through generations.


Typically, male cats are larger than female cats in terms of both weight and overall dimensions.

This is especially noticeable in certain breeds where the difference between male and female cats can be several pounds or more.

For instance, a male Maine Coon might outweigh a female counterpart by a significant margin.

Similarly, in most mixed-breed domestic cats, tomcats (males) are often bulkier and possess a more robust frame than females.


Proper nutrition and health during a cat’s formative months can significantly impact its adult size.

Malnourishment or illness can stunt growth, leading to smaller adult cats.

On the other hand, overfeeding can lead to obesity, which might give the appearance of a larger cat but is unhealthy.


Cats that are more active and engage in regular play and exercise are likely to develop stronger and more muscular bodies.

Sedentary cats may not grow to their full potential or could become overweight.

Cat Size Calculator

Learn more: How Big Will My Cat Get Calculator

How Big Does The Average House Cat Get?

The average house cat typically weighs between 8-10 pounds and measures 9-10 inches in height at the shoulder, with a length of 18 inches (excluding tail).

Can You Tell How Big A Cat Will Get?

Predicting a cat’s adult size is challenging, but factors like breed, parental size, and paw size can offer clues. Do consider that genetics, health, and nutrition also play roles, making exact predictions difficult.

Parental Size

Looking at the size of a kitten’s parents, especially if they’re purebred, can give indications.

If both parents are notably large or small, their offspring are likely to follow suit.

Paw Size

Observationally, kittens with larger paws often grow into larger cats.

While not a foolproof method, it’s a common anecdote among cat enthusiasts and breeders.

At What Age Is A Cat Full Grown?

A cat is typically considered full-grown between 12 to 18 months of age. However, some larger breeds like Maine Coons might take up to 4 years to reach their full size.

Most cats are deemed adult by the age of one, meaning they’ve reached their maximum height and length.

By the age of 12 to 18 months, many cats have achieved their full physical maturity.

During this period, they transition from playful and often rambunctious kittens into more settled adults, though many retain a playful spirit.

However, there are exceptions based on breeds.

Larger breeds, notably the Maine Coon, grow at a slower pace.

While a Maine Coon kitten will be larger than most other kittens of the same age, it continues to grow gradually and might not attain its full majestic size until it’s around 3 to 4 years old.

Furthermore, while the skeletal structure might be fully developed by 18 months, some cats might continue to fill out or gain muscle mass beyond this age, especially if they are active or if their diet and exercise regimens change.

In essence, while most cats are full-grown by 18 months, certain breeds and individual circumstances can extend this timeline.

How Big Is A Year Old Cat?

A one-year-old cat typically weighs between 7 to 10 pounds and measures about 9-10 inches in height at the shoulder.

Cat Size By Breed/By Color


Bengal cats boast a sleek, muscular build with a distinctive spotted or marbled coat that resembles wild leopards or ocelots. Their athletic bodies and striking appearance make them a favorite among cat enthusiasts.

  • Typical Height: 9-11 inches at the shoulder
  • Typical Weight: 10-15 pounds
  • Full Adult Size Age: 1.5-2 years


Calico isn’t a breed but a color pattern, characterized by a white coat with patches of at least two other colors, often black and orange. Calico can appear in various breeds, each with its size standards.

  • Typical Height: Varies based on breed
  • Typical Weight: Varies based on breed
  • Full Adult Size Age: Varies based on breed


Munchkin cats are notable for their short legs, a result of a genetic mutation. Despite this, they’re active and agile, with a playful and affectionate nature.

  • Typical Height: 6-9 inches
  • Typical Weight: 5-9 pounds
  • Full Adult Size Age: 1 year


Ragdolls are large, affectionate felines with striking blue eyes and semi-long fur. Their name comes from their tendency to go limp when lifted, reminiscent of a ragdoll toy.

  • Typical Height: 9-11 inches at the shoulder
  • Typical Weight: 10-20 pounds
  • Full Adult Size Age: 3-4 years

Russian Blue

Russian Blues have a short, dense coat of bluish-grey and captivating green eyes. They are known for their gentle demeanor and elegant appearance.

  • Typical Height: 9-10 inches
  • Typical Weight: 7-12 pounds
  • Full Adult Size Age: 1-1.5 years


A hybrid of the serval wildcat and domestic cats, Savannahs possess long legs and striking coat patterns. They’re known for their high energy and dog-like personalities.

  • Typical Height: 9-14 inches, can vary by generation
  • Typical Weight: 8-20 pounds, depending on generation
  • Full Adult Size Age: 1-3 years


Siamese cats have a sleek, slender build with almond-shaped blue eyes and color-pointed fur. They are vocal and social, often forming strong bonds with their human companions.

  • Typical Height: 9-10 inches
  • Typical Weight: 5-10 pounds
  • Full Adult Size Age: 1-1.5 years


Sphynx cats are best known for their nearly hairless appearance, though they often have a fine layer of fuzz. Their exposed skin means they’re warm to the touch, and they’re known for being affectionate and playful.

  • Typical Height: 8-10 inches
  • Typical Weight: 6-12 pounds
  • Full Adult Size Age: 1.5-2 years


Like Calico, Tabby refers to a coat pattern, not a breed. Tabbies have a distinct “M” mark on their foreheads and striped or spotted patterns. They can be found in many breeds, each with its own size parameters.

  • Typical Height: Varies based on breed
  • Typical Weight: Varies based on breed
  • Full Adult Size Age: Varies based on breed