Tools / Pet Age Calculator
Pet Age Calculator
How old is your dog or cat in human years? Enter their age below — for dogs we adjust for size, since larger breeds age faster — and we'll also tell you their life stage.
Enter your pet's age to see their human-years equivalent.
This is a friendly estimate based on common veterinary aging charts. Individual pets age differently — your vet is the best judge of your pet's real life stage.
How pet years are calculated
The old "multiply by 7" rule isn't accurate. Pets age fastest early in life and then slow down. A common veterinary model counts the first year as about 15 human years, the second year as about 9 more (roughly 24 by age two), and then a steady number of years for each year after — about 4 for cats and small dogs, and more for larger dogs.
When is a pet a "senior"?
Cats are usually considered senior around 11. Dogs vary by size: small breeds around 10–11, medium around 8–9, large around 7, and giant breeds as early as 6. Reaching the senior stage is a good moment to focus on joint support, comfortable bedding, and twice-yearly vet checks.