🐈 How Big Will My Cat Get Calculator
Estimate how big your kitten will get as an adult, based on their current weight and age.
How kitten growth works
Most domestic cats reach close to their full adult weight by around 12 months old, though some large breeds like Maine Coons keep filling out until 3-4 years. In the typical first year, a kitten’s weight climbs steadily: roughly half of adult weight by 4 months, and around 95% by a year old.
How this calculator works
Enter your kitten’s current weight and age in months. The calculator interpolates along a typical domestic-cat growth curve to estimate what percentage of adult weight your kitten has likely reached, then divides current weight by that percentage to project adult size.
This is a general estimate based on population averages — breed, sex, and neuter status all affect final size. For breed-specific projections (such as for Maine Coons or other large breeds), consult breed growth charts or your veterinarian.