How big will your cat get? Enter your kitten's details to predict adult size and track growth against breed standards.
Enter kitten details to predict growth
| Age | Small Breeds | Medium Breeds | Large Breeds |
|---|---|---|---|
| Newborn | 0.17–0.25 lbs | 0.22–0.31 lbs | 0.28–0.40 lbs |
| 8 weeks (2 months) | 1.3–1.8 lbs | 1.8–2.5 lbs | 2.5–3.5 lbs |
| 4 months | 2.5–3.5 lbs | 3.5–5 lbs | 5–7 lbs |
| 6 months | 3.5–5 lbs | 5–7 lbs | 7–10 lbs |
| 9 months | 4–6 lbs | 6.5–9 lbs | 10–14 lbs |
| 12 months (Adult) | 5–8 lbs | 8–12 lbs | 12–22 lbs |
| 18 months (Full maturity) | 5.5–9 lbs | 9–13 lbs | 15–25+ lbs |
Most cats reach their full adult size by 12 months of age. However, large breeds like Maine Coons continue growing until 18-24 months. Male cats typically grow larger than females of the same breed.
A healthy kitten should gain approximately 0.25–0.5 lbs (100–250g) per week during rapid growth phases (weeks 2-16). After month 4, the rate slows to about 0.1–0.2 lbs per week. Consistent weekly weighing helps catch health issues early.
Compare your kitten's weight against our breed-standard table. If it's more than 15% below the range for its age and breed, consult a vet — it may indicate parasites, illness, or inadequate nutrition. More than 20% above may mean overfeeding.
Yes! Cats neutered before 6 months tend to grow taller and longer because sex hormones that close growth plates are absent. They may end up slightly larger than intact cats but can also be prone to weight gain if overfed after surgery.