FOR THE LIFE YOU SHARE
Growing older.
Growing closer.
They grow up in a heartbeat. Discover their age in human years, and the little moment your ages meet.
Just between you and your pet
Two ages.
One shared story.
Add your ages to see how your story unfolds.
A little time travel
Drag to watch both of you grow. Ages use the same human-year scale, not a lifespan countdown.
A PNG of your result, created right here. Birth dates aren’t included. The card includes the ages shown. Sharing is your choice; website links contain no personal inputs.
THE LITTLE DAYS ARE THE BIG DAYS
More reasons to celebrate.
A birthday, a gotcha day, a family of very different ages. Make room for all of it.
Their next happy day
Count down to a birthday or adoption anniversary. Don’t know their birthday? A gotcha day is a lovely place to start.
Pick a date to find your next reason for cake (pet-friendly, of course).
One local calendar event. Nothing is sent and no online reminders are created. For February 29, we use February 28 in non-leap years.
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.
Choose a little challenge
A little understanding goes a long way.
Cat years, explained
A fast first chapter, then a gentler rhythm. Discover what cat age charts really say.
Dog years, without the ×7
A little dog and a big dog don’t age the same way. Size belongs in the picture.
What is a same-age day?
Your age keeps moving, too. We find the point where your two timelines cross.
A LITTLE SCIENCE. A LOT OF LOVE.
Thoughtful estimates.
Honest little asterisks.
There isn’t one universal formula for pet age. We use published veterinary age charts, with straight-line interpolation between their points. Our same-age calculation moves your age and your pet’s age forward together.
See the model & sources ↗More than “times seven”
Cats mature quickly in their first two years. Dogs’ age equivalents also vary by adult size.
A guide, not a diagnosis
Breed, health and individual development matter. These charts don’t measure biological age or predict lifespan.
Your story stays yours
Calculations stay on your device. Your ages, names and dates are not sent or saved. If you choose to share a card, your system share sheet handles the selected image.
A few curious questions
Is one dog year really seven human years?
No. Dogs mature much faster early in life, and adult size changes the relationship. A chart-based estimate gives a more useful picture than multiplying every age by seven.
Can our same-age day be in the past?
Yes. We check the part of the timeline when both of you have been born, as well as the future within the published chart. If your pet is already older in human years, your crossing may have already happened.
What if I don’t know my pet’s birthday?
Use your best estimate in years and months. Your result will be approximate. The anniversary tool also works with an adoption date independently of a birthday.
Does the chart’s last age mean a pet’s expected lifespan?
No. It is only the edge of this chart’s coverage. The time-travel display compares ages; it is not a countdown of anyone’s remaining life.
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.