Dog & Cat Age Calculator
Convert your pet's age into human years using current veterinary guidance — not the outdated "multiply by 7" rule.
About the Dog & Cat Age Calculator
The Pet Age Calculator converts your dog's or cat's age into approximate human years. For dogs it accounts for size, because larger breeds age faster, and it avoids the old rule of multiplying by seven.
Pets mature quickly in the first two years. This tool counts the first year as about 15 human years and the second as about 9 more, giving 24 at age two. After that, a dog adds roughly 4 (small), 5 (medium), 6 (large) or 7 (giant) years per year, and a cat adds about 4. These are approximations used for fun and general understanding, not a veterinary assessment.
How to use it
- Choose dog or cat.
- Enter the pet's age in years.
- For dogs choose the size group.
- Read the equivalent human age.
Tips and good to know
- Use decimals for young pets, such as 0.5.
- Senior pets benefit from more frequent vet visits.
- Individual animals vary.
Frequently asked questions
Is the old 7-year rule correct?
No, it is a simplification.
Why does size matter for dogs?
Large dogs generally have shorter lifespans.
Is this veterinary advice?
No.