Cat age calculator: cat years to human years

How old is your cat, really?

Enter your cat's age to see it in human years and its life stage, using the chart vets use. Switch to dog for dog years by size.

In human years

human years

Life stage: Adult

Cat age chart

A cat reaches about 15 human years at its first birthday and 24 at its second. After that, each cat year adds about 4 human years.

Cat age in human years
Cat age	Human age	Life stage
1 years	15	Junior
2 years	24	Junior
3 years	28	Adult
4 years	32	Adult
5 years	36	Adult
6 years	40	Adult
7 years	44	Mature
8 years	48	Mature
9 years	52	Mature
10 years	56	Mature
11 years	60	Senior
12 years	64	Senior
13 years	68	Senior
14 years	72	Senior
15 years	76	Super senior
16 years	80	Super senior
17 years	84	Super senior
18 years	88	Super senior
19 years	92	Super senior
20 years	96	Super senior

How old is my kitten?

For a young kitten of unknown age, compare it with these signs. Weights are typical for a healthy kitten; small breeds and strays may weigh less.

Kitten age by appearance
Age	Weight	Signs
Under 1 week	50–150 g	Eyes closed, ears folded, umbilical cord may still be attached
1 to 2 weeks	150–250 g	Eyes start to open and are blue, ears still folded
2 to 3 weeks	250–350 g	Ears stand up, first wobbly steps
3 to 4 weeks	350–450 g	Baby front teeth come in, walks more steadily
4 to 5 weeks	450–550 g	Canine teeth come in, starts to play and explore
5 to 8 weeks	550–850 g	Starts eating wet food and using a litter box, eye colour starts to change
8 weeks	≈ 900 g	Full set of baby teeth, ready for first vaccination

Under 1 year, kitten months convert to human years like this: 2 months ≈ 2, 4 months ≈ 6, 6 months ≈ 10, 7 months ≈ 12.

Dog age chart

Dogs age like cats for the first two years. After that, large dogs age faster than small dogs, so a 10-year-old Golden Retriever is older in human years than a 10-year-old Shih Tzu.

Older pets need a quieter routine when you travel. PGH has separate rooms for cats and dogs.

Dog age in human years by size
Dog age	Small	Medium	Large
1 years	15	15	15
2 years	24	24	24
3 years	28	28	28
4 years	32	32	32
5 years	36	36	36
6 years	40	42	45
7 years	44	47	50
8 years	48	51	55
9 years	52	56	61
10 years	56	60	66
11 years	60	65	72
12 years	64	69	77
13 years	68	74	82
14 years	72	78	88
15 years	76	83	93
16 years	80	87	99

Common questions

How old is a 1-year-old cat in human years?

About 15. A cat grows up very fast in its first year, reaches about 24 human years at age 2, and then ages about 4 human years for every cat year.

Is one cat year equal to seven human years?

No. The seven-year rule does not fit cats or dogs. Cats age fastest in the first two years and more slowly after that, so a 10-year-old cat is about 56 in human years, not 70.

When is a cat a senior?

From about 11 years, which is about 60 in human years. From 15 years a cat is a super senior. Older cats benefit from a vet check every six months.

How can I tell how old a kitten is?

Look at the eyes, ears, teeth and weight. Eyes open at 1 to 2 weeks, ears stand up at about 3 weeks, baby teeth come in from 3 weeks and the eye colour starts to change from blue at about 7 weeks. A vet can give a closer estimate.

How do I work out the age of an adult cat?

A vet estimates it from the teeth, eyes, coat and muscle tone. Tartar and worn teeth suggest an older cat, and cloudy lenses usually appear in seniors.

Sources

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