Cat Age Calculator

Convert your cat's age to human years using AAHA veterinary guidelines. Cats age much faster in their first two years.

AAHA and AAFP guidelines: Year 1 ≈ 15 human years, Year 2 ≈ 24 human years, then approximately +4 years per additional cat year. Indoor cats live 12–18 years; outdoor cats average 5–7 years.

Cat's Age (years)

Enter partial years (e.g. 0.5 for 6 months)

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Cat Age

4 yrs

48 months

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Human Equivalent

32 yrs

AAHA estimate

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Life Stage

Prime Adult

Peak physical condition, full personality

Life Progress

~15 year avg indoor lifespan

Birth

27% of avg lifespan

~15 yrs

Cat Years to Human Years — Full Chart

Cat Age	Human Equivalent	Life Stage
6 months	8 human years	Kitten
1 years	15 human years	Junior
2 years	24 human years	Junior
3 years	28 human years	Prime Adult
4 years	32 human years	Prime Adult
5 years	36 human years	Prime Adult
6 years	40 human years	Prime Adult
7 years	44 human years	Mature Adult
8 years	48 human years	Mature Adult
9 years	52 human years	Mature Adult
10 years	56 human years	Mature Adult
11 years	60 human years	Senior
12 years	64 human years	Senior
13 years	68 human years	Senior
14 years	72 human years	Senior
15 years	76 human years	Geriatric / Super Senior
16 years	80 human years	Geriatric / Super Senior
17 years	84 human years	Geriatric / Super Senior
18 years	88 human years	Geriatric / Super Senior
20 years	96 human years	Geriatric / Super Senior