Pet Age Calculator
Convert your dog's or cat's age into human years — size-adjusted, not the old times-7 myth.
Medium (21–50 lb) dogs age about 5 human years per dog year after age two. The old "multiply by 7" rule is a rough myth — pets mature fast early, then slow down.
What Is the Pet Age Calculator?
The Pet Age Calculator converts dog and cat ages into human-equivalent years using modern veterinary guidelines: pets mature very quickly in their first two years, then age at a steadier rate that depends on size for dogs. It also shows the DNA-methylation research formula for comparison.
How It Works
Pick dog or cat, enter the age (and dog size), and see the human-year equivalent instantly.
When to Use It
Use it to understand your pet's life stage — puppy, adult or senior — and adjust care accordingly.
Frequently Asked Questions
- Is one dog year really seven human years?
- No — that's a myth. A 1-year-old dog is more like a 15-year-old human, and large dogs age faster than small ones after age two.
Last reviewed: 2026-06-27