How Big Will My Cat Get Calculator

Your details

Your kitten's age in weeks. The formula works best for kittens 4-36 weeks old.
weeks
Your kitten's weight right now. Weigh on a kitchen scale for accuracy.
lb
Breed size shifts the expected adult weight range. When in doubt choose Average.
Male cats average about 20-25% heavier than females of the same breed.
Predicted adult weightYoung kitten - lots of growing to do
7.7

Estimated full-grown weight at 12 months

Unitlb
Growth completed31%
Expected weight at 6 months6.1
Weeks until fully grown42
Typical adult range for breed/sex8.4 to 11.4 lb
Adult weight (kg)3.48
Current weight (kg)1.09
31% %
Young kitten<40Growing fast40-70Nearly adult70-90Fully grown90+

Predicted adult weight: 7.7 lb.

  • At 10 weeks your kitten has completed about 31% of its expected growth.
  • Most average-size male cats reach their full size between 10 and 12 months of age, with large breeds like Maine Coons sometimes taking up to 18-24 months.
  • Weigh your kitten weekly until 6 months old to track progress and catch any growth slowdowns early.
  • Nutrition is the biggest controllable factor: feed a high-protein kitten food until at least 12 months.

Next stepFor the most accurate prediction, re-calculate every 4 weeks as your kitten grows.

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