Maine Coon Cat Size: How Big Do Maine Coon Cats Get?

Maine Coon cats are one of the biggest breeds of domesticated cats, and it is precisely the size of this breed which makes it unique and attractive for so many owners. Male Maine Coons can weigh 15 to 25 pounds and measure up to 40 inches from nose to tail, while females usually weigh around 10 to 18 pounds. What usually catches most first-time Maine Coon owners unprepared, however, is not the weight of the breed, but rather the fact that Maine Coons stay kittens on the inside much longer than many other cat breeds.

Maine Coon Size Chart

Those are the commonly quoted Maine Coon average weight, height, and length ranges rather than an official standard, as the sources differ, and the individual cats differ too. Factors like sex, genetics, body type and overall health affect the size range a given cat will fall in, and weight alone does not describe a Maine Coon. The row about the weight of a kitten reflects our own observations of the Maine Coon kittens at CatsDogs.us, and is not meant to be applicable to all litters in the world.

Average Weight

But how big are Maine Coon cats really? An average adult cat of the breed will have a weight of 10 to 25 pounds, with males being heavier and females lighter. However, there are exceptions, as genetics, body type and health condition of the cat will affect the size. The Cat Fanciers' Association describes the breed simply as "large and muscular" rather than setting a specific weight range. The size should not come at the expense of good health of the cat. The figures that circulate around the average weight of a Maine Coon are usually taken from breeders and veterinarians who observe this in actual cats.

As to the weight alone, however, it does not describe the size of the cat fully. Two cats having the same weight may look very differently according to the distribution of that weight.

Average Height and Length

On average, Maine Coons are 10 to 16 inches tall at the shoulder. This places the tallest cats of the breed above the height of an average house cat and the shortest cats closer to the average. However, this is not the main characteristic of the Maine Coon size.

The Maine Coon length is usually measured from nose to tail, including the tail. The commonly quoted size of an average adult Maine Coon is around 30 to 40 inches from nose to tail, although it varies depending on individual cats and sources. In addition, at CatsDogs.us we have noticed that heavier Maine Coon kittens tend to be longer, although this is not true in every case.

The cats that set records for the breed's size are a totally different story from the average Maine Coon. The longest cat ever, Stewie, has a length of 48.5 inches, and Barivel, the longest living domestic cat, has a length of over 47 inches. Those are not the averages to expect from an average Maine Coon.

Male vs. Female Maine Coon Size

As for the difference in male and female size, males are noticeably bigger, both in terms of weight and length.

As for the kittens of the breed that we see at CatsDogs.us, males are noticeably bigger than females and tend to retain the advantage through their whole life.

Female Maine Coons are not small by ordinary standards: an adult female Maine Coon will outsize most domestic shorthaired cats, but if the size of the cat is your primary motive, go for a male.

How Maine Coon Kittens Grow

This is where the breed is different from most other cat breeds. Maine Coons are a slowly maturing breed: a kitten can look almost grown-up at one year and continue to grow further.

As for the kittens, they usually start gaining weight and body size unevenly at different ages, and the length of this period also varies for individual cats.

In the case of Maine Coon kittens between roughly 3 months and 1 year old, the weights can vary from 4 to 16 pounds, depending on the cat and the parents' size. Nutrition and pedigree can also make a noticeable difference between kittens of the same age. At CatsDogs.us, we've had kittens that stood out for their size at an early age. At 12 months old, most Maine Coon kittens are far from finished growing, and based on our observations, most of them continue filling out until 3 years old.

Maine Coon Size by Age

There is no universally accepted figure for the weight of Maine Coon kittens and adult cats at each age; those figures usually vary by source and individual kitten. However, the pattern of the growth and maturation process of the breed is more consistent:

The weight of a kitten at 3 or 4 months old does not reliably predict the adult size. That is one of the most common misconceptions buyers fall prey to, and that should be kept in mind throughout the entire table.

Here are a few facts about the Maine Coon growth pattern:

• Weight and length do not always grow at the same rate. The Maine Coon size is not only about the mass of the body, but rather about the frame as well, which means that two kittens may grow differently.
• Paw size can be a visual clue, but not a guarantee. In our experience, larger paws are usually visible in kittens that will develop into larger cats, but paw size alone does not reliably predict the size of the kitten in the future.
• A large kitten does not necessarily grow up into a large cat. There are some kittens that look impressive from the very beginning, but stop growing early and end up having an average adult size, while there are some kittens that look quite ordinary and then turn into the largest kittens in the litter. The growth is not linear, and genetics of both parents play the role.
• Kittens of the same age can be very different sizes. From what we see at CatsDogs.us, the difference can be quite noticeable, and nutrition, pedigree, and the size of the parents all contribute.

Photo by CatsDogs.us

When Do Maine Coons Stop Growing?

The process of growing does not usually stop abruptly, and is not predictable in advance. Based on our observations, most Maine Coons continue growing up until 3 years, and some may continue growing a little bit afterwards as well. In general, what happens is a long and uneven period of growth, and not a single growth spurt, which is followed by the cat gaining adult size gradually.

This is also why Maine Coon length by age is difficult to predict precisely. One kitten may gain length earlier and fill out later, while another can develop at a different pace. There is no single chart that can tell you exactly what a particular kitten's Maine Coon full size will be.

What Determines How Big a Maine Coon Gets

A few factors play together in order to make a cat reach its adult size:

• Sex. The males are usually bigger than females.
• Genetics. The size of a kitten is quite proportional to the size of the kitten's parents, which is why buyers usually inquire about the parents' size when trying to choose a kitten. The information about the parents' size may be helpful for buyers in understanding what size to expect from a certain kitten, although it is not a guarantee: siblings in one litter can have different adult sizes.
• Nutrition. Proper age-related and balanced diet helps a kitten reach the full potential of its genetics, but feeding it more and feeding some special product will not make it genetically bigger. The size depends primarily on the genetics and parentage. One mistake owners sometimes make is buying cheap food in an attempt to save money or feeding more in the hope of making the cat bigger. Good-quality food is more important for healthy development than trying to push growth.
• Overall health. Diseases, parasites, or lack of proper nutrition can affect the growth even if the genetic potential is high.

Maine Coon Size vs. an Average Domestic Cat

These are the typical ranges rather than an official figure from some single source, and the individual cats may differ. However, compared to a common house cat, Maine Coon weight ranges can overlap more than many people expect: an average domestic shorthair and a small female Maine Coon can weigh the same. The length and body structure is where the difference is more noticeable.

This is the main point to keep in mind when looking at Maine Coon size vs normal cat or Maine Coon size vs regular cat comparisons. Weight alone does not always make the difference obvious. The longer body and larger frame are usually what make a Maine Coon look much bigger.

Maine Coon vs. Other Large Breeds

Maine Coons are among the biggest domestic cat breeds, but other breeds can equal or exceed them in terms of size. Here is a quick Maine Coon size comparison with a few breeds that buyers often inquire about:

Among the breeds people are likely to compare side by side, Maine Coon remains the benchmark of "big cats" in North America.

Photo by CatsDogs.us

What a Large Cat Means to Live with Every Day

Maine Coon's size has some practical implications, although fewer than people usually expect if you plan for the adult cat, not the kitten:

• Litter box, carrier and furniture. These do not require anything special or expensive. According to our buyers, size usually causes no problems if everything is chosen with the adult cat in mind: the litter box is spacious enough to turn around in and dig in, the carrier is spacious enough, and the scratching post or cat tree is sturdy enough for an adult cat.
• Feeding. Our buyers often ask if a cat of such a big breed needs more food. The straightforward answer is that the portions should depend on the individual cat's weight and activity level. Owners also tend to underestimate how much a cat this size eats compared with a typical housecat. Trying to feed a kitten more just to make it bigger is not the right approach. Good nutrition supports healthy growth, but it does not change the cat's genetics.

None of this requires specialized or expensive gear. It just means buying with the adult cat in mind, not only the kitten you're starting with.

If you're wondering what size litter box for a Maine Coon, choose a large or extra-large box that gives the adult cat enough room to turn around and dig comfortably. The same basic idea applies to carriers, scratching posts and beds. We don't generally find that Maine Coon owners need special products just because of the breed's size, as long as the ordinary products are chosen correctly.

Common Myths About Maine Coon Size

"Maine Coons are part raccoon." This is folklore, not biology. Cats and raccoons can't interbreed. The myth likely comes from the breed's bushy, ringed tail and semi-feral New England origins.

"Every Maine Coon is enormous." Averages describe a range, not a guarantee. Plenty of Maine Coons top out closer to 10-12 pounds, particularly females, and still carry every other trait of the breed.

"A big kitten always becomes a huge adult." As covered above, early size is a loose indicator at best. Genetics, more than anything else, determines where a kitten ends up, and that plays out gradually over a period of uneven growth, not in a straight line from how a kitten looks at three or four months.

"Big means overweight." Size and body condition are two different things. An overweight Maine Coon and a naturally large, lean one can look similar at a glance, but they're not the same. A large-framed cat can be entirely lean, and a smaller one can be overweight. Vets typically assess this by feel, checking for a visible waist and being able to feel, not see, the ribs, rather than by weight number alone.

"All Maine Coons have heart problems." This is another concern we sometimes hear from buyers. In our experience, choosing a responsible and reputable breeder is important when buying a Maine Coon kitten. A good breeder should pay attention to the health of breeding cats and be open about their lines and health history.

Is a Maine Coon's Size Right for You?

Based on our experience, size is one of the main reasons people are drawn to Maine Coons, and around 90% of the buyers we talk to mention it as an important factor. People who contact us about a Maine Coon are usually already familiar with the breed and aren't coming in with major doubts.

A few honest points are still worth keeping in mind before bringing one home: this is a cat that eats more than an average housecat, is worth choosing carriers and furniture for with its adult size in mind, and may keep developing for a while past kittenhood. For many buyers, these are simply practical considerations that are easy to plan for rather than discovering after the fact.

Choosing a Maine Coon from a reputable, responsible breeder, and asking about the parents' size and health history, is the most useful step toward knowing what to expect, whether you're looking at Maine Coon kittens in general or a specific color line like grey Maine Coon kittens.

The Bottom Line

Maine Coon size comes down to two things working together: genuinely large averages for weight and especially length, and a growth timeline that stretches years longer than most cat breeds. Male or female, the number that matters most isn't a kitten's weight at three months. The size of the parents and the kitten's individual genetics are far more informative, and from there, healthy nutrition and proper care give the kitten the best chance to reach its natural adult size.

If you're researching Maine Coon cats size before choosing a kitten, don't focus only on the biggest numbers you can find online. Look at the parents, ask about their size and health history, and remember that a kitten's appearance at three or four months doesn't tell the whole story. From our experience, buying from a checked and responsible breeder is the most important step.