Pet Age Calculator
Convert your dog's or cat's age into human years using a non-linear veterinary approximation, not the old 'times 7' rule.
This uses the commonly cited veterinary approximation, where the first two years count for more and aging slows afterward — not the old "multiply by 7" rule, which is inaccurate. Larger dog breeds tend to age faster than smaller ones.
Overview
A more accurate take on a very commonly searched question, using an approximation that accounts for the non-linear way cats and dogs actually age.
- Separate formulas for dogs (by size) and cats
- Reflects faster early-life aging, unlike the flat 'times 7' rule
- Instant result as you adjust the age or size
How to use it
- 1Choose dog or cat
- 2Enter your pet's age
- 3For dogs, select a size category
Frequently asked questions
Why not just multiply by 7?
That old rule doesn't reflect how pets actually age — the first two years account for a disproportionate amount of aging, and the rate slows down afterward. This calculator uses a more realistic, commonly cited approximation instead.
Why does dog size matter but cat size doesn't?
Dog breeds vary enormously in size and lifespan, and larger breeds are well known to age faster after early adulthood. Cats vary far less by breed, so a single formula works reasonably well across most cats.