Maine Coon Size Guide – How Big is too Big?

How Big Will Your Maine Coon Grow to be?

What is Needed to be a Maine Coon Size?

Maine Coons are one of the largest domesticated cat breeds but size is not just a matter of coincidence there is a combination of factors:

🔹 Genetics: Genetically, the size of a Maine Coon is largely determined by genetics. If you have a kitten from a line of extra-large Maine Coons, there is a better chance that it too would grow big. However, there is no certainty because a kitten from the largest cat could end up being an average size. Size can vary even in a litter of kittens.
🔹 Diet & Nutrition: A high-quality diet is important for proper growth for your Maine Coon. The right type of nutrition, rich in protein, supports the proper development of bones/muscles.
🔹 Sex: Generally speaking, male cats are larger than female cats; however, there are exceptions, as there are some females who are close to the same size as smaller males.
🔹 Spaying & Neutering: There is no doubt that early spaying/neutering can delay kitten growth slightly, as hormones affect bone growth, but this does not significantly alter final adult size.
🔹 Activity levels and exercise: Active kittens build stronger muscles, while those kittens that do not play are more likely to gain extra weight instead of lean muscle.

Maine Coon Size Charts

The data in this article comes from some actual Maine Coon kittens and cats at Sassy Koonz. Some of them have been tracked from kitten ages to adult ages. This data will give you a good indicator of the “average” weights you can expect from either gender at any age.

Maine Coon Weight Charts by Age and Gender

Maine Coons are slow-growing, reaching full size between ages 3-5 years. Below is a real life weight chart based off Wild Looking Coons breeding information.

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
🔹 Average weights for males when reached maturity are typically between 20-25 lbs! 📏
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 –
🔹 Average weights for females are generally smaller, typically 10-15 lbs when reached full size.