Pet age converter

Convert a dog's or cat's age into a rough human-year equivalent.

Pet

Calculated in this browser. Nothing is sent anywhere.

A population-level approximation, not a health measure: year 1 ≈ 15 human years, year 2 ≈ 24 (dog) or 25 (cat), then +4/+5/+6 per year for small/medium/large dogs and +4 for cats. Breed, weight, and care shift an individual's aging; a vet's assessment differs.

How to use

  1. Choose dog or cat.
  2. For dogs, pick the size.
  3. Enter the age and read the equivalent.

What it supports

Population-level estimate: year 1 ≈ 15 human years, year 2 ≈ 24 (dog) / 25 (cat), then +4/+5/+6 per year by dog size and +4 for cats. Breed and individual variation are not modelled.

Related tools

Related guides