Kitten YearsCat age calculator and life-stage guide

Cat years made simple

Cat Years to Human Years Chart

Use this chart to compare your cat's actual age with an approximate human-age equivalent and life stage.

Kitten age chart

The first year moves fast. These kitten-month estimates are approximate, but they help show why young kittens change so much in only a few weeks.

Cat ageApprox. human ageLife stageGuide
1 month1.3KittenRead guide
2 months2.5KittenRead guide
3 months3.8KittenRead guide
4 months5KittenRead guide
5 months6.3KittenRead guide
6 months7.5KittenRead guide
7 months8.8KittenRead guide
8 months10KittenRead guide
9 months11.3KittenRead guide
10 months12.5KittenRead guide
11 months13.8KittenRead guide
12 months15Young adultRead guide

Cat age by year chart

After the second birthday, the common estimate adds about four human years for each cat year.

Cat ageApprox. human ageLife stageGuide
1 year15Young adultRead guide
2 years24Young adultRead guide
3 years28Young adultRead guide
4 years32Young adultRead guide
5 years36Young adultRead guide
6 years40Young adultRead guide
7 years44Mature adultRead guide
8 years48Mature adultRead guide
9 years52Mature adultRead guide
10 years56Mature adultRead guide
11 years60SeniorRead guide
12 years64SeniorRead guide
13 years68SeniorRead guide
14 years72SeniorRead guide
15 years76Super seniorRead guide
16 years80Super seniorRead guide
17 years84Super seniorRead guide
18 years88Super seniorRead guide
19 years92Super seniorRead guide
20 years96Super seniorRead guide
21 years100Super seniorRead guide
22 years104Super seniorRead guide
23 years108Super seniorRead guide
24 years112Super seniorRead guide
25 years116Super seniorRead guide

Why the chart is only an estimate

Human-age charts are useful because they give cat owners a quick sense of life stage. They are not a medical test. A healthy, active 13 year old cat may seem younger than the chart suggests, while a younger cat with health issues may need extra support sooner.

Helpful next pages

Use the CalculatorEnter years and months for a quick result.Cat Age by YearJump to exact yearly age pages.Kitten Age by MonthExplore the first year month by month.

Common questions

What is the easiest cat years formula?

A common estimate is 15 human years for the first cat year, 24 human years by the second cat year, then about four human years for each cat year after that.

Why are kitten months included?

Kittens change so quickly that month-by-month ages are more useful during the first year.

Can two cats of the same age seem very different?

Yes. Health, lifestyle, genetics, activity, weight, and veterinary care can all affect how old a cat seems.