Kitten Growth Calculator
Estimate your kitten's weight at a future age based on typical monthly weight gain during the growth phase.
Awaiting Details
Enter your kitten's details to see their projected weight.
How It Works & The Growth Formula
International Cat Care and the Cornell Feline Health Center note that kittens typically gain about 0.45 kg (1 lb) per month during their first 5 months, after which growth slows as they approach their adult weight (typically reached around 10-12 months).
This is a general guideline, not a precise prediction -- growth rate varies by breed, genetics, litter size, and nutrition. Larger breeds like Maine Coons continue filling out well past a year.
Frequently Asked Questions
How much weight should a kitten gain each month?
International Cat Care and the Cornell Feline Health Center note that kittens generally gain about 0.45 kg (1 lb) per month for their first 4-5 months, then growth slows as they approach adult weight.
When do kittens reach adult weight?
Most domestic cats reach their adult weight around 10-12 months old, though some larger breeds (like Maine Coons) may keep filling out until 3-4 years old.
Why is my kitten's growth different from the estimate?
Growth rate varies with genetics, breed, litter size, and nutrition. This calculator gives a general guideline -- if your kitten seems to be gaining much faster or slower than expected, or seems lethargic, check in with your vet.
How should I feed a growing kitten?
Kittens need significantly more calories per kg of body weight than adult cats to fuel growth. Use our Puppy & Kitten Feeding Calculator to estimate daily calories and portion size.
Medical Disclaimer
This tool provides general, educational estimates and is not a substitute for professional veterinary advice, diagnosis, or treatment. This tool provides a general growth estimate. A kitten gaining much faster or slower than expected, or showing reduced appetite or energy, should be evaluated by a veterinarian. Always consult your veterinarian about your pet's specific health needs before making changes to their diet, water intake, or care routine.
Related Tools
Growth Chart
Visualize expected weight curves by breed size.
Puppy & Kitten Feeding Calculator
Calorie and portion needs for growing pets.
Cat Age Calculator
Convert your cat's age to human years.
Pregnancy & Gestation Calculator
Estimate a due date from the breeding date.
How This Calculator Works
Read the full breakdown of the formula, sources, and how to interpret your result.