Cat years made simple

Cat Years to Human Years Chart

A 1 year old cat is about 15 in human years, a 2 year old cat is about 24, and each cat year after that adds about 4 human years.

The simple cat age rule

A one year old cat is about 15 in human years. A two year old cat is about 24. After that, add about 4 human years for each extra cat year.

This chart keeps kitten months and cat years together so you can compare a young kitten, an adult cat, and a senior cat without jumping between pages.

Kitten age chart

The first year moves quickly. A 2 month old kitten, a 5 month old kitten, and a 12 month old kitten can feel like very different stages.

Cat age	Estimated human age	Life stage	Guide
1 month	1.3 human years	Kitten	1 month old kitten
2 months	2.5 human years	Kitten	2 month old kitten
3 months	3.8 human years	Kitten	3 month old kitten
4 months	5 human years	Kitten	4 month old kitten
5 months	6.3 human years	Kitten	5 month old kitten
6 months	7.5 human years	Kitten	6 month old kitten
7 months	8.8 human years	Kitten	7 month old kitten
8 months	10 human years	Kitten	8 month old kitten
9 months	11.3 human years	Kitten	9 month old kitten
10 months	12.5 human years	Kitten	10 month old kitten
11 months	13.8 human years	Kitten	11 month old kitten
12 months	15 human years	Young adult	12 month old kitten

Cat age by year chart

After the second birthday, the common estimate adds about 4 human years for each cat year.

Cat age	Estimated human age	Life stage	Guide
1 year	15 human years	Young adult	1 year old cat
2 years	24 human years	Young adult	2 year old cat
3 years	28 human years	Young adult	3 year old cat
4 years	32 human years	Young adult	4 year old cat
5 years	36 human years	Young adult	5 year old cat
6 years	40 human years	Young adult	6 year old cat
7 years	44 human years	Mature adult	7 year old cat
8 years	48 human years	Mature adult	8 year old cat
9 years	52 human years	Mature adult	9 year old cat
10 years	56 human years	Mature adult	10 year old cat
11 years	60 human years	Senior	11 year old cat
12 years	64 human years	Senior	12 year old cat
13 years	68 human years	Senior	13 year old cat
14 years	72 human years	Senior	14 year old cat
15 years	76 human years	Super senior	15 year old cat
16 years	80 human years	Super senior	16 year old cat
17 years	84 human years	Super senior	17 year old cat
18 years	88 human years	Super senior	18 year old cat
19 years	92 human years	Super senior	19 year old cat
20 years	96 human years	Super senior	20 year old cat
21 years	100 human years	Super senior	21 year old cat
22 years	104 human years	Super senior	22 year old cat
23 years	108 human years	Super senior	23 year old cat
24 years	112 human years	Super senior	24 year old cat
25 years	116 human years	Super senior	25 year old cat

Cat years people often check

A 7 year old cat is about 44 in human years. A 10 year old cat is about 56. A 13 year old cat is about 68, and a 15 year old cat is about 76.

For older cats, the number is only part of the picture. Comfort, appetite, mobility, litter box habits, grooming, and routine matter too.

How the calculator fits in

The homepage calculator uses your cat's birthday, so it can estimate age by years and months instead of whole years only.

Use the cat age calculator

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 clearer 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.

Is this cat age chart exact?

No. It is a friendly estimate for understanding life stage, not a medical measurement.