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Dog & Cat Age Calculator

How old is your pet in human years?

※ Aging varies widely by breed, health and environment. Consult a veterinarian for health decisions.
Age conversion table
Pet ageHuman age
1 yrabout 15 human years
2 yrabout 24 human years
3 yrabout 28 human years
4 yrabout 32 human years
5 yrabout 36 human years
6 yrabout 40 human years
7 yrabout 44 human years
8 yrabout 48 human years
9 yrabout 52 human years
10 yrabout 56 human years
11 yrabout 60 human years
12 yrabout 64 human years
13 yrabout 68 human years
14 yrabout 72 human years
15 yrabout 76 human years
16 yrabout 80 human years
17 yrabout 84 human years
18 yrabout 88 human years
19 yrabout 92 human years
20 yrabout 96 human years
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FAQ
Is one dog year really seven human years?
No. Dogs mature very fast in the first two years, then age at a rate that depends on body size. One year is roughly 15 human years and two years is roughly 24, after which small breeds add about 4 human years annually and large breeds about 6.
Which size should I pick?
Use adult body weight: up to 9 kg is small, 10-22 kg medium, 23-40 kg large, and 41 kg or more giant. If your dog sits between two ranges, pick the closer one.
Why is there no size option for cats?
Body size varies far less between cat breeds than between dog breeds, so a single curve is used: about 15 human years at age one, 24 at age two, then roughly 4 per year.
What if I do not know the birth date?
Switch to manual entry and put in an estimated age. For rescued pets a veterinarian can often estimate age from tooth wear and general condition.

How pet years convert to human years

The old rule of multiplying by seven is no longer used. Pets compress more than two decades of human development into their first two years, and after that larger bodies age noticeably faster than smaller ones.

The model used here

What matters more than the number

Treat the converted age as a way to locate your pet on a life-stage map rather than a precise measurement. Breed, body condition, dental health and indoor or outdoor living all shift the curve. Past the equivalent of 45 human years, annual bloodwork and dental checks are worth adding, and past 65 many vets suggest moving to twice-yearly visits.

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