How Big Will Your Maine Coon Be?
If you’re looking for a Maine Coon size chart to compare growth stages, you’ve come to the right place! Maine Coons are known for their majestic size, but just how large do they grow?
In this guide, you’ll find actual weight data from our Sassy Koonz kittens. This information will help you understand your cat’s expected growth pattern.
📏 What Determines the Size of a Maine Coon?
Maine Coons are one of the largest domesticated cat breeds, but their size isn’t just luck—it’s a mix of multiple factors:
🔹 Genetics: The size of a Maine Coon is primarily determined by genetics. If a kitten comes from a line of extra-large cats, there’s a higher chance it will grow big too. However, there are no guarantees, as size can vary even within the same litter.
🔹 Diet & Nutrition: A high-quality diet plays a crucial role in your Maine Coon’s growth. Proper nutrition, high in protein, supports healthy muscle development and bone structure.
🔹 Gender Differences: Males tend to be larger than females, but exceptions exist. Some females may reach sizes comparable to smaller males.
🔹 Spaying & Neutering: Early spaying/neutering can slightly slow down growth as hormones play a role in bone development. However, this does not drastically affect their final adult size.
🔹 Exercise & Activity Levels: Active kittens build stronger muscles, while inactive ones may gain excess weight instead of lean muscle.
Maine Coon Size Charts
The data shown in this article has been compiled from actual Maine Coon Kittens and cats at Sassy Koonz, some being tracked from kitten ages to adults. This will help determine the “average” weights that you can expect based on the gender and age of your cat.
📊 Maine Coon Weight Charts by Age and Gender
Maine Coons grow slowly, reaching their full size between 3-5 years old. Below is a real weight chart from Sassy Koonz breeding data. 🐾
Male Maine Coon Growth Chart
| Name | 4 Months | 6 Months | 1 Year | 2 Years | 3 Years | 5 Years |
|---|---|---|---|---|---|---|
| Finlay | 4.8 lb | 8.8 lb | 14.8 lb | 15.8 lb | 16.5 lb | 19 lb |
| Omega | 7.1 lb | 9.8 lb | 22 lb | 27.9 lb | 29 lb | 32 lb |
| Biggie | 4.2 lb | 9.8 lb | 17.1 lb | 22 lb | 26 lb | 29 lb |
| Beastie | 7 lb | 9.5 lb | 18 lb | 21 lb | 22 lb | N/A |
| Average | 5.7 lb | 9.5 lb | 17.9 lb | 21.6 lb | 23.4 lb | 26.6 lb |
🔹 Males typically weigh between 20-25 lbs at full maturity! 📏
Female Maine Coon Growth Chart
| Name | 4 Months | 6 Months | 1 Year | 2 Years | 3 Years | 5 Years |
| Ursula | 5 lb | 6.4 lb | 10.3 lb | 10.6 lb | Retired | Retired |
| Tiffany | 4.9 lb | 7 lb | 9 lb | 10 lb | 10.8 lb | 14 lb |
| Magic | 5.0 lb | 8.0 lb | 10.5 lb | 12.5 lb | N/A | N/A |
| Chichi | 5.9 lb | 8.1 lb | 11.7 lb | 12 lb | 16 lb | 18 lb |
| Average | 5.6 lb | 7.5 lb | 10.7 lb | 11.8 lb | 13.1 lb | – |
🔹 Females are generally smaller, averaging 10-15 lbs at full size. 🏆
Are Male Maine Coons Bigger than Females?
A male will be considerably larger than a female. However, a female can grow to be just as big. This will depend on the genetics and the lines being used for breeding.
Usually, there’s a significant between the size of male and female Maine Coons. In the photo below you’ll see a female Maine Coon at 12 pounds, and a male at 19 pounds.
📅 When is a Maine Coon Fully Grown?
Most cats reach full size by 1 year old. In contrast, Maine Coons continue growing until they are 3-5 years old. The first year is the fastest growth phase, with steady muscle development afterward. 🏆
The first year of a Maine Coon’s life is when they go through the biggest and quickest growth. They’ll reach about 80% of their weight by the time they are one year of age. For a few years following that, they’ll continue to build muscle mass and add a bit more weight and size.
From my experience, you’ll spend months admiring your kitten as it grows, cherishing every playful moment. Then, seemingly overnight, you’ll look at them and realize—they’ve transformed. Fully grown, confident, and exuding that majestic, wild charm that makes Maine Coons so extraordinary. 🐾
🐱 Biggie’s Growth: At 1 year old, he weighed 17 lbs. Now, at 9 years old, he’s 30 lbs of muscle!
He’s a pet only and not part of my breeding program.
🌍 Maine Coon Size vs. Other Breeds
| Breed | Average Weight (Male) | Average Weight (Female) |
| Maine Coon | 20-25 lbs (9-11 kg) | 10-15 lbs (4.5-6.8 kg) |
| Norwegian Forest Cat | 13-22 lbs (6-10 kg) | 9-18 lbs (4-8 kg) |
| Savannah Cat | 12-25 lbs (5.4-11.3 kg) | 10-18 lbs (4.5-8.1 kg) |
| Ragdoll | 15-20 lbs (6.8-9 kg) | 10-15 lbs (4.5-6.8 kg) |
📢 Don’t Get Caught in the Size Hype!
Many breeders claim to breed “giant” Maine Coons, but size alone doesn’t determine quality. Overly large Maine Coons may suffer from hip dysplasia, heart disease, or joint issues. 🐾
Instead of focusing on size, a responsible breeder prioritizes: ✅ Strong genetics 🧬 ✅ Excellent temperament 🐾 ✅ TICA standards ✅ ✅ Long-term health over extreme size 🏥
Sassy Koonz does not breed for the “giant” sized Maine Coons. Instead, we strive to produce kittens that will grow into healthy, average weight adults. The absence of long term health problems is far more important to us than the size.
How long is a Maine Coon cat?
The average size Maine Coon adult can be between 10 and 16 inches (about 25 and 41 cm) tall and can reach a maximum length of 40 inches 100 cm, including the tail capable of reaching 14 inches (about 36 cm) in length.
Biggest Maine Coon on Record
The Maine Coon cat holds the Guinness Book of World Records for being the longest cat in the world. The popular cat, Barivel, is 47.2 inches long from the tip of his nose to the end of his tail.
As you can see, they can easily out-weigh a small dog. Maine Coon cats are one of the biggest breeds of domestic cats. They are tall and well-built, wide-chested, with a long body. They have big slanted eyes, long, shiny coat, and a long bushy tail. They are very gentle and playful pets, receptive to kids and other animals.
Check out a few video clips of some of the biggest Maine Coon cats on record!
Choose a Breeder Based on the Quality of their Cats
Many breeders will put an emphasis on how “big” their cats are. While that is a fascinating trait that the Maine Coon exhibits, it’s certainly not the most important.
Cats that are extra large are at a greater risk of hip dysplasia, heart disease and arthritis. While they might be cool to look at and admire, they may suffer health issues later in their life because of it.
Don’t Get Caught Up in the Size Hype
Do your research when choosing a Maine Coon breeder and try not to get caught up in the hype of a breeder who claims to breed “giant” cats. It’s a commonly used selling point, but Coonies are large by nature. they will always make a “regular” cat look tiny when sitting side by side.
Maine Coon Size: How Photography Tricks Make Them Look Even Bigger
There are so many viral photos of giant Maine Coons. It’s understandable that people are fascinated by just how big these cats really are! But here’s a little secret—many of those jaw-dropping photos use a simple trick to exaggerate a Maine Coon’s size.
If you’ve ever been amazed by a photo of a Maine Coon the size of a dog, you’re not alone! But before you assume these cats are the size of small lions, let’s discuss a classic photography technique. This technique makes objects appear larger than they really are.
While Maine Coons are undeniably large, don’t be fooled by photo manipulation tricks that make them seem even bigger.
Many of the viral photos and videos you see online are strategically taken to enhance their size. They use the forced perspective technique.
To prove this, watch the TikTok Video where I do a demonstration.
I also took two photos of my own Maine Coons:
- In the first image, I held my cat close to my body.
- In the second image, I extended my arms outward, bringing the cat closer to the camera lens.
The result? The second image makes my Maine Coon look twice the size—even though it’s the exact same cat!
Having a big Maine Coon is really fun.
They’re super cuddly, they keep me warm at night and they’re an amazing part of my family. There’s so much more to them that just the size.
Being a gentle giant is just one of the physical characteristics that make them so special. There’s a long list of fantastic attributes that this breed exhibits that you don’t want to miss out on!
I prefer to keep my focus on health, temperament, and meeting the Maine Coon breed standard.
I think those three areas are the most important.
Here are some photos of really large Maine Coon cats from another popular Maine Coon website.
Thanks for the information I have a female she is 11 mths and she weight almost 13 lbs
Thanks for the information. My male weighed 9.8 lbs at 6 months and 10.8 lbs at 7 months. So I guess I can probably expect him to get fairly large!
We had a cat we lost last year that was 3/4s coon. Good cat but occasional temper issues. We saw an ad for a full coon kitten that looked just like him so we went and got him. At 6 months the new kitten is already bigger but the best part of him is his temperament. I dont think we will have another cat that isnt a coon. Your cats are beautiful.
My boy is 9 months, 42″ and 20lbs. Guess he will be one of the biggins!
I grew up with 2 maine coon brothers, they lived to be 21 and 22 years old, amazing cats! I just adopted a new kitten I named Fynn, just 2 months ago and realized he had alot of similar characteristics… well, he’s doubled at least in size in 2 month, comes very close to the size of my full grown male cats and I just weighed him at 7 lbs and he’s 4 months and 1 week old today! His features have quickly become undeniable, lol.
Hello.. I love your page.. we adopted our baby at the Babylon animal shelter. And he was a tiny peanut. His name is swish.. named after our two tuxedo cats that passed to the Rainbow bridge. Snoopy and Whiskers. He is now double the size of what a normal 5 month would be and he is 30 inches long. He has huge paws and tree trunk legs. But he is full of love!!
Let me know if you know if you want me to send pictures
Thank you