We Love Cats and Kittens is supported by its audience. When you purchase through links on our site, we may earn an affiliate commission. Learn more.

when do cats stop growing in size

When Do Cats Stop Growing? 

When I first brought my Maine Coon kitten home, he was a bundle of fluff barely bigger than my hand. Within a month, he had practically doubled in size. Now we’re a year on, and I struggle to fit comfortably on the same sofa as him when he’s fully stretched out.

They grow up so fast…

While Maine Coon’s are a little different from your average moggy, they share a common trait. Kittens grow into cats pretty darn quick.

The question is, when do cats stop growing and when are your little balls of fluff no longer kittens? When is little snowball going to reach her full size, and how do you know when you should be switching your kittens over to adult cat food?

By the time you’re done here, you’ll have the answers to all of those questions and more.

Let’s get started.

Cat Development: The Different Stages

Your kitten needs to proceed through various essential stages before they transform into an adult cat, just like a child moves through different stages to become a fully-grown person. 

when do kittens stop growing

There’s a bit of debate among zoologists (animal scientists) over exactly when different stages begin an end. However, there are a handful of fundamental states that all the experts agree on:

  • Newborn: This is the stage when your kitten looks like a fluffy potato. They weigh practically nothing, and they probably won’t be able to open their eyes for the first couple of weeks either. Kittens are very reliant on their mother at this point for everything from warmth, food, and cleaning.
  • First month: Following week 3, your kitten will start to wean, consuming little bits of solid kitten food, as well as their mother’s milk. These kittens also learn to become more independent, playing, and scraping with their siblings
  • Second month: At this time, your kitten will be eating on its own, causing trouble, and starting to get curious about other animals and people in your household. The socialization stage in the second month of life is very important, as it ensures that your kitten doesn’t become a grumpy loner in adult life.
  • Six to Twelve Months: During this stage, your kitten will begin to adopt a more definitive size and shape. They become a young adult, with the same gangly teenage features that you would expect from a human. They’ll usually be pretty skinny during this time. That’s thanks in part to their ability to burn off their food with tons of playful energy. 
  • One to Three years: After a year of age, most vets will call your kitten a full adult cat. However, the stage up to three years of age is usually the same as human adolescence. In other words, you’ll have a slightly rebellious cat that’s still growing in some places. At least you don’t have to worry about tattoos and piercings with adolescent kitties. 
  • Adult stage: Finally, past year 3, most cats will adopt a definitive cat and stop growing. The exercise that your kitten got during the early stages of its life will help to dictate it’s shape. What’s more, moments of socialization during early stages will help with temperament too!

How Do I Know if My Cat is Still a Kitten?

Sometimes, when you adopt a cat, you’ll have a good idea of how old it is. Most shelters and breeders can give you this information. You might even be able to get a kind of birth certificate. However, if you’re taking in a stray, you won’t know for certain how old they really are. 

If you don’t know first-hand whether you’re caring for a cat or a kitten, knowing how to tell the two apart could give you some guidance when it comes to making decisions about what food they need, and what kind of vet visits may be on the horizon. 

Here are some pointers that could help you to figure out if your cat is still a kitten.

  • Fur: Kittens have a fluffier, downy coat compared to an adult cat. Adults have slightly sleeker fur, while senior cats are more likely to use some of their shine due to problems with grooming.
  • Size: Seems obvious, but kittens are often smaller boned. Some seem to have paws that are too large for their bodies, or bigger heads and tiny bodies. Your cat’s size could indicate whether you’re dealing with a kitten or not.
  • Facial features: Kittens have more of a round face with big eyes and feathery soft cheeks (adorable!). As your cat grows older, their facial features become more pronounced, causing their face to appear longer.
  • Teeth and eyes: All kittens have blue eyes when they’re born, but these begin to change at around 6 weeks. You can also check your cat’s teeth. If your kitty has tiny little teeth, their adult fangs may not have come through yet.
  • Energy levels: Cats can be just as energetic as kittens at times. However, you’re more likely to have a lively and playful kitten than you are to have an extremely playful adult cat. If your feline is more laid back, they may have entered adulthood.

When do Cats Stop Growing: How Big Will Your Cat Get?

Usually, the biggest question that cat parents ask us is “when do cats stop growing in size,” or “how big will my cat get?” The average house cat is usually around 10 pounds in weight and about 46cm (18 inches) long without the tail. 

Unfortunately, figuring out exactly how big your cat is going to be is tough. With puppies, there’s a connection between things like paw size and weight or height. However, cats are a lot more mysterious. Just because your kitten has big toe-beans doesn’t mean it’s going to be a gigantic cat.

The most significant things that impact your cat’s overall weight and size when he or she reaches adulthood is the amount of food and exercise they get, and their breed.

Get 30% off and FREE shipping on cat food!

U.S.A. only

To Find out why we recommend chewy.com, click here

Another point to note? Mr. Kitty is likely to get a bit bigger than Mrs. Kitty. Male cats are generally a lot bigger than female ones, because the growth of a male lasts a little longer. Because of this, male cats may be up to 2 pounds heavier than their female counterparts.

When Do Cats Stop Growing: Considering Breed

Usually, the average cat will stop growing completely after about year 3 of their lives. You probably won’t notice a lot of growth after year one, unless your cat loves their treats, in which case you might see an expanding waistline.

However, while all domestic cat breeds stop growing quite fast, there are some variances between breeds. For instance, giant cat breeds like the Maine Coon can take up to four years before they reach their full size. Savannah cats and Domestic Shorthair cats are also relatively slow-growing too, often taking around 2-3 years to achieve their full size. Here are a few common breeds and when they stop growing in most cases:

  • Persian, Sphynx and Siamese cats: 1 year
  • European shorthair and Bengal: 2 years
  • Norwegian Forest and British Shorthair: 3 years

Let’s look at some of the more popular breeds in greater depth.

We're looking at the average size range of a fully grown cat in these breed examples and giving a normal maximum size. With some breeds the sizing is pretty consistent, but with others the height and weight range of a fully grown cat can be very wide.

Bear that in mind when comparing your kitty to our chart or listings of the size of a fully grown cat and for when that breed of cat stops growing.

We all know there's some massive Maine Coons and Savannah cats out there, but there's also a few oversize domestic moggies too!

Cat Breed

Height

Weight (Male)

Weight (Female)

Singapura

Smallest breed

6-8in

6-8lb

4-6lb

Munchkin

Small to Medium breed

8-9in

6-9lb

4-8lb

Domestic Short Hair

Medium breed

8-10in

8-16lb

6-10lb

Bengal

Medium to Large breed

9-11in

10-15lb

8-12lb

Ragdoll

Medium to Large breed

11-13in

12-16lb

9-13lb

Maine Coon

Large breed

12-16in

14-20lb

8-14lb

Savannah

Very Large breed

14-20in

18-25+lb

15-20+lb

How Big do Maine Coons Get?

Maine coons hold the world record for being the biggest cat breed of all. Mine is currently around a year old and growing more every day. 

The Maine Coon world record holder, Stewie, was 48.5 inches long when he won his title. Overall, Maine Coons can grow to around:

  • Height: Up to 16 inches
  • Weight: Up to 20 pounds (but can reach or even exceed 25 pounds)
  • Length: Up to 45 inches
  • Time growing: 4 years

These cats are huge, but they also tend to keep a lot of their kitten-like mannerisms as they grow. Maine Coons are very cuddly and loving cats, although they may not spend a lot of time on your lap, which might be good for your blood circulation.

When do Maine Coon Cats Stop Growing?

This is an interesting question purely because of the vast sizes that this breed can grow to.  Whilst most breeds reach their full growth at about 2 years of age, the Maine Coon cat can grow until they are about 4 years old! So considerably longer!

How Big do Bengal Cats Get?

Bengals are another example of a cat that can grow quite large. Often described as a tiny leopard, Bengal cats are beautiful creatures. The original Bengal comes from a combination of an Asian Leopard cat and domestic cat. 

Bengal size can reach up to 22 pounds (usually for males). However, around 14 pounds is usually the common size.

  • Height: Up to 11 inches
  • Weight: Up to 15 pounds (but can reach or even exceed 22 pounds)
  • Length: Up to 16 inches
  • Time growing: 2 years

Bengals stop growing a lot earlier than Maine Coons, but they can still be pretty large by the time they reach adulthood.

When do Bengal Cats Stop Growing?

This can depend with Bengals, most will reach full size at around two years old, but some cats can continue to grow until age 3.

when is a cat full grown

How Big do Savannah Cats Get?

I’m lucky enough to have both a Maine Coon and a Savannah cat in my household, so I’m pretty familiar with big cat breeds. The Savannah is a hybrid breed, similar to a Bengal cat, that’s made up of half domestic cat, and half African serval. 

These beautiful cats vary in size depending on how close they are to their serval ancestors. For instance, an F1 is larger than all other classes. However, you can get Savannah cats all the way down to F6, which indicates that the kitty comes from a line of Savannah cat parents.

  • Height: Up to 20 inches
  • Weight: Up to 25 pounds (but can exceed this for the largest of the breed) 
  • Length: Up to 25 inches
  • Time growing: 2 - 3 years

Savannah cats don’t get as big as the biggest of their Maine Coon counterparts; however, they are incredibly muscular creatures, which means that they can weigh quite a bit.

When do Savannah Cats Stop Growing?

They generally take about 2 – 3 years to reach full size and, interestingly, can live between 17 – 20 years which is a little longer than a lot of other breeds.

How Big do Ragdoll Cats Get?

Ragdoll cats are another fascinating breed of big cat. Around 45% of the ragdoll cat’s DNA goes back to the same singular cat: Raggedy Ann Daddy Warbucks. 

These stunning and cuddly cats are another breed that, similar to Maine Coons, can grow for several years, getting bigger and bigger over time. In some cases, they can grow up to 26 inches in length.

  • Height: Up to 13 inches
  • Weight: Up to 16 pounds (but can reach or even exceed 20 pounds)
  • Length: Up to 26 inches
  • Time growing: 4 years

These delightful cats are often described as one of the many “giant” cat breeds on the market today. However, they won’t get nearly as big as some of the other breeds I’ve mentioned.

When do Ragdoll Cats Stop Growing?

Ragdolls are also a little different. They, like the Maine Coon breed, can take up to 4 years to reach their full size.

When do Domestic Shorthair Cats Stop Growing?

Let’s finish with a common cat breed favorite – the Domestic shorthair. Despite the name, these cats can trace their origins back to ancient Egypt. They’re what we tend to call one of the oldest known cat breeds in the world, even though they aren't really a distinct breed and are more of a 'mix of all sorts'. Nonetheless, like many other kitties, they can mature quite slowly. 

Domestic shorthair enthusiasts say that these stocky cats often get a lot bigger than most people expect, typically growing for up to 3-4 years. 

And, because they can have so many different parts to their breed makeup they can vary in size enormously. Your average moggy is going to be somewhere in the middle of the 10 pound to 14 pound range, but you'll see some big fellas growing much larger.

  • Height: Up to 10 inches (but some can be nearly twice as tall)
  • Weight: Up to 16 pounds (but can reach or even exceed 20 pounds)
  • Length: Up to 20 inches
  • Time growing: 4 - 5 years

Breeds like the DSH (Domestic ShortHair), and the others mentioned here show you just how much variety there is in the sizes of our feline friends. There are also tiny cats out there too, like Rexes and Singapuras, that stay incredibly small. 

The Singapura is a playful and cuddly cat that generally only grows to a size of around 8 pounds in total. It’s big eyes and ears mean that you get a lifelong kitten-like cat as a companion.

When do Tabby Cats Stop Growing?

Many of us refer to our Domestic Short Hair as a Tabby because oif their coloring, but this growth information applies to all Domestic Short Hairs regardless of their color and markings. It's equally true of your ginger Tomcat as it is of your fluffy mongrel mix!

That said, most Tabbies reach their maximum size at 18 months, which is when most kittens stop growing. Some Tabbies may still grow a little after this stage, but at a slower pace.

When do Kittens Stop Growing?

One thing to keep in mind here is that although your cat’s weight will depend on their breed, you’ll need to keep a close eye on how much weight your four-legged friend is gaining for the sake of their health. The last thing you want is an overweight moggy. What’s more, felines that are underweight can often be more likely to suffer from various pathologies too!

how long do kittens grow

With that said, you can expect a kitten to be growing at a pretty impressive rate. Whilst your kitten might look like an adult cat by the time they are 6 months old, most breeds are still growing to some degree up to a year old and then, as we've seen, in some cases for a while longer.

The average cat weight will help you see where in their growth your cat is so we've put together this average cat weight chart:

Stage of Cat

Average Weight

Newborn Kittens

3oz - 4oz (Growing 3oz - 5oz in first week)

2 - 3 Weeks

6oz - 8oz

4 - 5 Weeks

8oz - 1lb

8 Weeks

1.5lb - 2lb

12 Weeks

Approx 2.5lb - 3.5lb

16 Weeks

Approx 4lb - 8lb

18 - 24 Months

Approx 8lb - 12lb+ (depending on breed)

However, we’d recommend checking with your vet on how much weight your cat should be gaining at any given time and it is breed dependent.

Kittens usually double in size within the first week and grow an ounce every three days from thereon. For the first sixteen weeks of a kitten’s life, you’ll see the most growth at the most rapid rate. Make sure that you make the most of those playful kitten weeks while they last!

Is Your Cat Overweight?

If you’re a first time cat owner, it’s often difficult to tell whether your cat is growing correctly or gaining too much weight too fast. What’s more, if like me, you have a kitty that’s constantly begging for your food at every meal; it can be tempting to give them some extra treats. 

Unfortunately, overweight cats suffer from a number of health problems that can significantly impact their quality of living. To check your feline friend isn’t gaining weight too quickly, one option is to feel along your cat’s ribcage. For healthy cats, the padding shouldn’t feel too much thicker than the padding on your own hand. If you have to press quite firmly to feel your cat’s ribs, she might be piling on the pounds. 

Another way to check if your cat is gaining too much weight is to take a birds-eye view. Stand over your kitty and see whether her sides are bulging outwards. This could indicate that he or she is a bit on the tubby side. Remember, some cats are more likely to become overweight or obese. For instance, male cats are more likely to gain weight than females, and there are certain breeds that have a hard time preventing themselves from overeating.

Studies also show that free-feeding your cat by giving them a bowl of kibble to constantly graze on could mean that they’re more likely to end up overweight. 

If you think that your cat is a little chunky, don’t instantly switch to diet food. Your best option is to start by speaking to your vet. A vet will be able to tell you how much work you need to do to get your cat back to its ideal size. Many vets can also recommend certain kinds of food that ensure your kitty is getting the right amount of nutrients. 

Remember, when you are trying to reduce your cat’s weight, don’t jump into controlling her food intake and cutting back too quickly. Reducing the amount of food your cat has access to very quickly could lead to stress that presents other health problems for your feline. What’s more, switching immediately from a standard food to a diet meal could lead to sickness if your kitty isn’t used to the new ingredients. 

Most vets will recommend transitioning gently to a new diet with your moggy and making sure that he or she gets plenty of extra exercises. You can look for opportunities to spend more time playing with your cat, using toys that force them to run around more often. Alternatively, if you’re feeling comfortable and you’re willing to invest in some lead training, you could use a harness to take your cat out for a walk. 

What Other Factors Affect How Fast Cats Grow?

Remember, your kitty’s growth isn’t just affected by their breed; it’s also influenced by diet too. Kittens need to consume a huge amount of calories during the first stages of your life, so don’t worry if you think you’ve got greedy guts on your hands

Your vet can give you more insight on how much you should be feeding your cat based on your weight, and I’d recommend getting that advice. If cats don’t get the right amount of food, their growth could end up stunted. 

Another thing that changes how much your cat will grow is neutering. Studies indicate that cats that are spayed or neutered in early life could grow a lot larger than those not spayed until adulthood. 

That’s why a lot of vets will recommend waiting until your kitty reaches full sexual maturity before you spay or neuter. Keep in mind that things like dwarfism and bone deformities can also cause a cat’s growth rate to change too. 

The best way to know for certain when your cat has stopped growing is to measure and weigh your kitty each month. Cats can continue to gain height and length even after they reach the one year mark. If you measure your feline at least once a month, you’ll notice when the measurements stop changing, and you’ll have a chance to grab a quick snuggle in-between measurements.

When to Feed Your Kitten Adult Food

Probably one of the main reasons you’ll want to know when your cat is going to stop growing, is so you can decide whether to feed them kitten or cat food. 

Ultimately, the right time to transition to adult food is a bit subjective. Most vets recommend around 10-12 months is when you should make the move – but that’s variable. My young Maine Coon has a hard time with weight control (he burns food off fast). Because of that, my vet recommends keeping him on kitten food until he turns 2. On the other hand, if you have a kitten that’s gaining a lot of weight on kitten food, your vet might ask you to make the switch earlier.

Remember, kitten food usually has more calories than adult food to help your little fluff ball grow big and strong.

So, When do Cats Stop Growing Then?

The answer to the question “when will my cat stop growing?” isn’t as straightforward as most people think. In most cases, with a standard cat, you can expect your kitty to continue growing until they’re about 12-18 months old. 

However, if you have a more exotic cat breed, like  British Shorthair, or a Maine Coon, then you could easily have years of growth ahead of you. It’s also worth noting that many things can prevent a cat from growing to its full size, including bone deformities, and things like dwarfism. 

It’s not always possible to tell immediately how much your cat is going to grow. 

Kittens grow up fast – too fast, in my opinion. However, the good news is that if you raise them right, your kitties will stay adorable and playful for years after they stop growing. Some breeds even maintain their child-like mannerisms throughout their entire lives. 

No matter when your kitty stops growing, make sure that you’re using plenty of toys and activity to keep them physically and mentally engaged. Adult cats need to play just as much as youngsters. 

What’s more, remember that no matter when your cat stops growing, they’re always going to need hefty portions of love and snuggles. That’s something they never grow out of.

Get 30% off and FREE shipping on cat supplies!

U.S.A only

To Find out why we recommend chewy.com, click here

Affiliate disclosure : We Love Cats and Kittens is a participant in several affiliate programs including the Amazon Services LLC Associates Program, and the Chewy affiliate program. These are affiliate advertising programs designed to provide a means for sites to earn advertising fees by advertising and linking to products on their sites. If you click on links in our blog posts and articles we may be paid a commission.