Question 1

How accurate is the cat-years formula?

Accepted Answer

It's a widely-cited estimate (a cat's first year ≈ 15 human years, its second ≈ +9 more, then roughly +4 per year after that) — not a medical or veterinary calculation. Indoor/outdoor lifestyle and breed both affect an individual cat's real aging.

Question 2

Does breed or size change a cat's age curve the way it does for dogs?

Accepted Answer

Not nearly as much — cats are far closer in size to each other than dog breeds are, so this calculator uses one curve for every cat rather than a size picker.

Question 3

My kitten is only a few months old — how do I enter that?

Accepted Answer

Enter age in years as a decimal, e.g. a 6-month-old kitten is 0.5. The first-year curve is linear, so any fraction works.

Cat Age Calculator

Common questions