How Big Is a Maine Coon Cat
Maine Coon cats are among the largest domestic cat breeds in the world. Adult males typically weigh between 13 to 18 pounds, while females average 8 to 12 pounds. In terms of length, a full-grown Maine Coon can measure up to 40 inches from nose to tail, with a height ranging between 10 to 16 inches.
This breed’s size isn’t just about numbers—it’s a defining part of their presence. Maine Coons carry their weight with grace, and their muscular frame, broad chest, and long, bushy tail make them unmistakable in any room they enter.
Average Maine Coon Size by Age
Maine Coon kittens start off looking similar to any other kitten breed, but the difference becomes more noticeable as they grow. By the time they hit 1 year, most are already larger than average adult house cats.
| Age | Average Weight | Development Milestone |
|---|---|---|
| 8 weeks | 2–3 lbs | Rapid growth begins |
| 6 months | 7–9 lbs | Muscular build develops |
| 1 year | 10–14 lbs | Approaches adult size |
| 3–5 years | 13–18 lbs (male), 8–12 lbs (female) | Full adult weight and length |
Unlike many cat breeds that mature by age 1, Maine Coons grow slowly and steadily over 3 to 5 years.
Why Are Maine Coons So Big?
A combination of genetics, evolution, and selective breeding contributes to their size.
These cats are believed to have originated in the cold climates of the northeastern United States, where a large, sturdy frame helped them thrive outdoors. Their powerful bodies, thick double coat, and strong paws evolved to handle snowy terrain and rugged landscapes.
Today’s Maine Coons inherit those same traits, amplified by breeders who emphasize health, size, and physical balance in their lines.
Maine Coon Weight Chart
Looking for a quick glance at size expectations? Here’s a general chart:
| Age (Months) | Male Weight | Female Weight |
|---|---|---|
| 3 | 4–6 lbs | 3–5 lbs |
| 6 | 7–9 lbs | 5–7 lbs |
| 12 | 10–14 lbs | 8–10 lbs |
| 24+ | 13–18+ lbs | 8–12+ lbs |
Keep in mind, individual genetics and diet can cause slight variations.
When Do Maine Coons Stop Growing?
Most cat breeds reach their full size by one year, but not Maine Coons. Their growth timeline can extend well into their fourth or fifth year.
That means their bodies stay in a growth phase longer than usual—gradually increasing in height, length, and weight over time. If your Maine Coon seems large at 12 months, know that they’re just getting started.
Male vs Female Maine Coon Size
The difference between males and females in this breed is significant. Males tend to have bulkier muscle mass, broader shoulders, and longer bodies.
Males:
13–18+ pounds
Up to 16 inches tall
More pronounced mane and ruff around the neck
Females:
8–12 pounds
Slightly smaller frame
More refined features
Regardless of sex, both share the same affectionate, playful temperament that makes Maine Coons a family favorite.
Signs Your Maine Coon Is Growing Too Fast—or Too Slow
Growth rate can be influenced by diet, genetics, and underlying health issues.
Watch for signs such as:
Potbelly or bony spine (underweight)
Stiff movement or heavy breathing (overweight)
Uneven growth spurts or sudden stops
If your cat’s weight doesn’t follow a general pattern or there’s a noticeable change in appetite or energy, it’s worth consulting a vet.
How to Support Healthy Maine Coon Growth
Feeding a Maine Coon isn’t just about filling a bowl—it’s about fueling a unique growth pattern.
1. Choose Breed-Appropriate Food
Look for formulas made specifically for large or giant breeds. They often include:
Extra protein (at least 35%)
Omega-3s for joint and coat health
Slow-release carbs to avoid weight spikes
Product Tip:
Consider brands like Royal Canin Maine Coon Adult Dry Food, which supports bone and joint strength and has kibble sized for their jaw.
2. Maintain Regular Exercise
These cats may be laid back, but they love to play. Use cat trees, teaser wands, and puzzle feeders to keep them active and lean.
3. Routine Vet Visits
Because of their size and slow growth, Maine Coons should be monitored closely during early years. Joint health, heart function, and weight are especially important.
FAQs
How long is a full-grown Maine Coon?
A typical adult Maine Coon can measure up to 40 inches from nose to tail tip.
Are Maine Coons bigger than normal cats?
Yes—most domestic cats weigh 8–10 pounds, while Maine Coons can exceed 18 pounds in males.
Can a Maine Coon weigh 20 pounds?
Yes, particularly large males with strong genetics and healthy diets can reach or exceed 20 pounds, though this should be closely monitored for health.
Do Maine Coons keep growing after a year?
Absolutely. Growth can continue up to 4 or even 5 years, unlike standard cats that finish developing at 12–18 months.