FOR THE LIFE YOU SHARE
One happy family.
Many little clocks.
The newest arrival might be the oldest in human years. Get to know your whole little crew, side by side.
Just between you and your pet
One family. Many ages.
Compare up to five pets on the same human-year scale. No one needs to be the oldest sibling forever.
Each species and adult size uses its own chart. Comparisons are estimates, never a health ranking.
Sources & assumptions
One scale, different ways of growing
A cat and a dog of the same calendar age are not necessarily the same age on these charts. At five years, a cat is about 36, a small dog about 36, and a giant dog about 42 in human years. Each pet gets its own species and adult-size model before we place the results on a shared scale.
A little tool for a multi-pet household
Compare up to five companions. Names are optional and values live only in this browser tab until you reload. An unknown age cannot produce a reliable conversion: use a reasonable age estimate or celebrate an adoption anniversary independently.
A higher equivalent age is not a health ranking or a lifespan prediction. Food, exercise and check-up plans should reflect the individual pet with guidance from your veterinarian.
Sources & assumptions
Model version / source check: 2026-10-01
Keep a little joy close
Install PetAge for a shortcut and offline pages after your first visit. It does not run scheduled reminders in the background; calendar events belong in your calendar app.
Privacy
No analytics, advertising, accounts or database. Calculator form values stay in memory and clear on reload. Cards and calendar files are made on your device. Game progress can be saved locally only when you enable it; it does not include calculator inputs. Public app files are cached for offline use. Sharing opens the system share sheet or a chosen social site. Hosting may process standard connection logs; no form values are put in URLs or requests.