About Pet Human Years

A free, fast way to find out how old your dog or cat is in human years.

We convert pet ages with the size-based chart vets use, and show the DNA-based formula and the old ×7 rule alongside it so you can see how they compare. Every chart and number on the site comes from the same calculation, explained with sources on how pet age is calculated.

These numbers are estimates for fun and general information. They are not veterinary advice. If you have questions about your pet’s health or aging, talk to your vet. The limits of what this site does and does not do are in the disclaimer.