Not “times seven”. Pets grow up fast in the first two years, then slow down — and big dogs age faster than small ones. Enter a birthday or an age and get the human-years equivalent from the vet charts, the life stage and how long until the next birthday.
Charts are averages; breed, weight and health matter more than any formula. Ask your vet about your own pet.
| Dog age | Small | Medium | Large |
|---|
Source: the dog-age chart from the American Veterinary Medical Association (as published by the AKC). Large breeds include e.g. Labradors and German Shepherds; giant breeds age faster still.
A newer, DNA-based estimate (Wang et al., Cell Systems 2020, studying Labradors) is human age ≈ 16 × ln(dog age) + 31: a 1-year-old dog ≈ 31, a 4-year-old ≈ 53, a 12-year-old ≈ 71. The calculator shows it as a second opinion.
| Cat age | 1 | 2 | 3 | 5 | 7 | 10 | 12 | 15 | 18 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|
| Human years | 15 | 24 | 28 | 36 | 44 | 56 | 64 | 76 | 88 | 96 |
Cats: about 15 human years for year one, 24 by year two, then about 4 per year (International Cat Care / AAHA–AAFP feline life stage guidelines). Life stages: kitten to 1 year, young adult 1–6, mature adult 7–10, senior over 10.
No. A 1-year-old dog is roughly a 15-year-old teenager and a 2-year-old about 24. After that each year adds about 4–6 human years depending on size, so the old “×7” rule is wrong at both ends.
Large and giant breeds grow quickly and have shorter average lifespans, so from about age 5 each year counts for more human years than for a small dog.
Cats from about 10. Dogs from roughly 7 (large breeds) to 10 (small breeds). Many vets suggest check-ups every 6 months from then on.
No. The calculator runs in your browser; nothing you type is sent anywhere.
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