How Big Will My Cat Get Calculator

Your details

Your kitten's age in weeks. The WALTHAM growth standard covers 8 to 78 weeks, so estimates from 8 weeks on are the most reliable; 4 to 7 weeks is extrapolated below the charted range.
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.
Sex changes both the finishing weight and the pace of growth. On the WALTHAM median curves a male domestic shorthair reaches 9.6 lb (4.35 kg) at 12 months against 7.0 lb (3.20 kg) for a female, and the female gets there sooner: half of her 12-month weight by about 14 weeks, against 16 weeks for a male.
Predicted adult weightYoung kitten - lots of growing to do
8.8

Estimated full-grown weight at 12 months

Unitlb
Growth completed27%
Expected weight at 6 months6.6
Weeks until fully grown42
Typical adult range for breed/sex8.4 to 11.4 lb
Adult weight (kg)4
Current weight (kg)1.09
27% %
Young kitten<40Growing fast40-70Nearly adult70-90Fully grown90+

Predicted adult weight: 8.8 lb.

  • At 10 weeks your kitten has completed about 27% 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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