Maine Coon Size Chart

Our Maine Coon size chart is the easiest way to quickly visualize how your Coonie is growing! A healthy kitten can honestly fall within a wide range of weights.

Did you know that Maine Coon kittens grow slower than other breeds? These big babies take their time, and it’s part of what makes them so special!

At just 8 weeks, your Maine Coon kitten could weigh between 1.5 to 4 pounds. By 16 weeks, they’re typically around 5 to 6 pounds!

But don’t be alarmed if they’re growing more slowly - these gentle giants don’t reach full size until they're 3 to 5 years old.

What’s important is steady growth. While some kittens may have growth spurts, others may progress more gradually.

It’s crucial to keep an eye on their weight and ensure they’re getting enough food, especially during their early months. A high-quality, protein-packed diet is key to supporting their rapid development.

Remember, the goal is a healthy, balanced weight. If you notice your kitten struggling to put on weight or growing too fast, it might be time for a vet check to make sure they’re on the right track.

So, how’s your kitten growing? Have you seen any big changes lately?

1st Year at a Glance:

Birth - 4 weeks (.2-2lbs)

• Eyes open at 7–10 days
• Begin to walk and explore
• Increase in feeding frequency

4 - 8 weeks (2-3lbs)

• Weaning from mom’s milk starts
• Socialization begins, plays with littermates

2 - 3 months (3-4lbs)

• Litter box training starts
• Beginning of personality development

3 - 4 Months (4-6lbs)

• More active, playful, and curious
• Teeth emerging, start teething

4 - 6 months (6-10lbs)

• Rapid growth phase
• Developing social bonds with family

6 - 8 months (7-12lbs)

• Transition to kitten food
• Beginning of puberty

9 - 12 months (8-16lbs)

• Many kittens are nearly full-grown
• Some will continue to grow (filling out) until 3-5 years, especially males

Chase's mom, Alison, shares that at a week shy of 9 months old he was a healthy 13.6 pounds. Perfection!

Ages & Stages

A Closer Look at What to Expect:

While our Maine Coon size chart provides a general guideline for kitten weight, it's important to remember that individual kittens can vary - just like people!

It’s totally ok for your kitten to fall outside of the ranges you see here. If your vet assures you that all is well, and your Coonie is healthy, that is all that matters.

For example, on our 5-month-old Maine Coon album, we see healthy kittens ranging from 6–11 lbs, which shows that weight can differ depending on genetics, diet, and activity level, even within the same age group.

2 Months (8 Weeks)

• Weight Range: 2–4 lbs

Milestones: Fully weaned from mother’s milk, beginning solid food (kitten food). Active and curious, exploring more of the environment. Eyes fully open and bright, with vision well-developed.

Teeth begin to emerge, and teething can make them a bit nippy. Learning socialization and basic behaviors (play fighting with littermates, exploring their surroundings).

3 Months (12 Weeks)

• Weight Range: 3.5-5 lbs

Milestones: Litter box training is mostly complete. Personality development begins - some may be more independent, while others show strong attachment to their humans.

Teeth are well-established, and they start chewing more as teething continues. Playful and energetic, learning to hunt by pouncing and chasing. More confident and social with other pets and humans.

4 Months (16 Weeks)

• Weight Range: 5.5–8 lbs

Milestones: Kitten’s coordination improves, with more agility in jumping and climbing. Stronger bond with humans - expect your Coonie to follow you around and seek attention. 

Get The MCCN Blog! 
Join this awesome community and get The Coonie Care Crash Course, straight to your inbox, for free!

Email:

First Name (optional):

Get The MCCN Blog!

   Fun tips, tidbits & insights to brighten your day!

Join us & get your free Coonie Care Crash Course!

Email:

First Name (optional):

We respect your email privacy

Some may show early signs of independence, but most still need their humans’ affection. Eating more solid food and transitioning fully to kitten food. Beginning to shed baby teeth.

5 Months (20 Weeks)

• Weight Range: 6–12 lbs

Milestones: Rapid growth phase, with noticeable size increase.Increased playfulness, including more complex games and climbing.

Developing coordination, running, and jumping more effectively. Beginning of puberty for some kittens (may start showing interest in mates).

Still teething, so expect some occasional chewing on furniture or toys. If you have both male and female young 'uns in the home, it's time to spay and neuter.

6 Months (24 Weeks)

• Weight Range: 6.5–13 lbs

Milestones: More independent, but still very affectionate with family members. Males may start marking territory as they approach puberty.

Full-on kitten play mode - fast, energetic, and always exploring. Teething is nearly finished, but some may still nibble. Starts to show more of their adult personality traits.

7 Months (28 Weeks)

• Weight Range: 7–14 lbs

Milestones: Still growing, though not as rapidly as earlier months. Social skills are more defined, and they may show a preference for certain family members.

May begin to settle into their unique behaviors (some may be quieter, others louder).

Beginning to lose the "kitten" look, with features becoming more elongated and sleek. Puberty may start in earnest, especially for males (potential behaviors like yowling).

8 Month Old Molly

8 Months (32 Weeks)

• Weight Range: 7–16 lbs

Milestones: Still in a growth spurt, though their development is beginning to slow down. More refined play behavior and increased interest in hunting or chasing. 

Fully engaged in bonding with their family - may follow you everywhere.

Some males may start to display more dominant or territorial behavior as their hormones kick in.

Kitten fur starting to shed, with adult fur beginning to come in. Take a look at Molly and her amazing ear tufts - she almost looks full grown already!

Ted at 9 months

9 Months (36 Weeks)

• Weight Range: 7.5–16.5 lbs

Milestones: Growth continues, but at a slower pace now that they are almost fully grown. Becoming more mature in behavior, with less rambunctious energy than earlier months.

Playtime may become less intense, and they may start relaxing and enjoying more quiet time.

Puberty is in full swing - males may become more vocal and show interest in mating behaviors. Adult fur is starting to replace kitten fur, making them look more like an adult Maine Coon - see Ted's mane beginning to fill in in the accompanying photo!

10 Months (40 Weeks)

• Weight Range: 7.5–17 lbs

Milestones: Most kittens are nearing their adult size but will still grow a bit over the next year. Social behavior is more defined, and they may settle into their “true” personalities.

Becoming more independent but still very affectionate with their family. Males may be fully mature and exhibit more dominant behaviors (marking territory, vocalizing).

Their fur is nearly fully grown in, with the typical Maine Coon mane beginning to take shape.

11 Months (44 Weeks)

• Weight Range: 7.5–18 lbs

Milestones: Nearing full size but may still grow in muscle mass. Social and behavior patterns are well-formed.

12 Months (1 Year)

• Weight Range: 8–20 lbs

Milestones: Many are nearing adult size, but some may continue growing. Females usually fall in the 8–12 lb range, while males may reach 20+ lbs.

18 Months

• Weight Range: 8–22 lbs

Milestones: Continued growth, especially in males. Fur and body shape continue to mature.

2 Years

• Weight Range: 8-25 lbs

Milestones: Most growth has slowed, but some Maine Coons may continue growing in size and muscle. They’ve reached full physical maturity but may fill out more with age.

31 pound Dalton

3 Years

• Weight Range: 8-30 lbs

Milestones: Full adult size for most. Weight may stabilize, and they’ll appear fully grown, with thicker coats.

4 - 5 Years

• Weight Range: 25-35 lbs

Milestones: Some male Maine Coons may reach the upper limit of the weight range. Full maturity - muscle mass and coat density fully developed.

Lillie shares her boy: "Dalton is a magnificent, sweet tempered 31 lb. Maine Coon from Georgia.

He loves to cuddle and nap with his humans, and in laundry baskets. His purr sounds like a lion. He knows no strangers."

About The Upper Weight Limit

Maximum Healthy Weight: While rare, some large Maine Coons can weigh up to 35 lbs around 5 years of age. However, most will settle into the 20-30 lb range by the time they reach full maturity.

Keep in mind that any Maine Coon that weighs over 30 lbs should be monitored by a vet, as obesity can be an issue, even with such a large breed.

What is a normal-sized, full-grown Maine Coon like? Well, they can open doorknobs!

Lisa in California shares of her 11 year old boy, Jojo: "He is 21 lbs and loves his humans. Like most Maine Coons, he is smart, and impatient when he feels its time to eat.

He goes through the house opening doors to search for everything he has already seen. We love him dearly."

About The Lower Weight Limit

Minimum Healthy Weight: Why is the lower weight line steady at 8lbs? While also quite unusual, some female Maine Coons top out at about 8lbs! 

Alice

Because this is healthy and normal for them, it’s a set-point on our chart for normal lower weight limit.

Although it’s fun to watch them grow, track their weight and guess how big they’ll be, many Maine Coons do NOT follow this upper level growth pattern. That is more than ok!

Here is a photo of my Alice, who never weighed an ounce over 8lbs, and was every bit a purebred, pedigreed, ebony Coonie goddess!

Maine Coon Size Chart

Maine Coon Size Chart

Top of Maine Coon Size Chart

« Back to Maine Coon Kittens

Recent Articles

• 
• 
• 

1. Toe-Bee is New in Our Albums!

   May 26, 25 07:15 PM

   Meet Amy's boy! She shares: "We decided to find a playmate for Apollo our black Maine Coon. So we adopted a white polydactyly deaf baby boy. He is the stepbrother to Apollo and share the same dad. He…

   Read More

2. Princess is Yowling All Night

   May 26, 25 11:09 AM

   On today's new addition, SamBam asks: "My parent's 15 year old female Maine Coon, Princess, has started yowling really loud at night. It's not a meow, it's more like a screech, and she can do it all n…

   Read More

3. 5 Month Old Maine Coon Kittens: In Photos

   May 25, 25 03:47 PM

   Looking at 5-month-old Maine Coon photos is a great way to compare your growing kitten to others! Pictures give you a glimpse into what to expect at this age. The kittens on this page are a variety of…

   Read More

FacebookXRedditWhatsAppPinterest