How accurate is the 0.45 kg per month growth estimate?

It's a solid average for healthy, well-nourished kittens in the first five months, but individual variation is real -- litter size, breed, nutrition quality, and health status all affect growth rate. Use it as a reference band rather than a precise prediction.

Does breed affect kitten growth rate?

Yes, particularly for larger breeds. A Maine Coon kitten grows more slowly on a per-month basis and takes longer to reach adult size than a domestic shorthair. The 0.45 kg/month rule is most applicable to average-sized domestic cats.

When should I switch my kitten to adult cat food?

Most kittens are ready to transition to adult food at around 12 months old. Large breeds like Maine Coons may stay on kitten food until 15-18 months. Always transition gradually over 7-10 days, and check with your vet if you're unsure about timing.

My kitten seems smaller than the calculator suggests -- should I be worried?

Not necessarily -- individual variation in frame size is normal, and some kittens are simply smaller-framed. What matters more than any single weight number is a consistent upward trend over time. If your kitten's weight has plateaued or dropped across multiple weekly weigh-ins, that's worth a vet visit.

How the Kitten Growth Calculator Works | PetCalculator

The Kitten Growth Calculator projects a kitten's weight at a future age using the standard ~0.45 kg (1 lb) per month gain rate for the first five months of life.