About PetAgeNow

A little perspective on your pet's age

PetAgeNow is a free dog and cat age calculator. Enter an age or birthday to explore a human-age estimate, a general life stage, and a care tip. You can save pets on this device and create a result card to share. No account is required.

How the estimates work

The calculator uses lookup tables, with separate tables for four dog sizes and one for cats. It interpolates between entries for ages in years and months. These are educational comparisons, not a measurement of biological age or a prediction of lifespan.

The tables have not been clinically validated. Health, genetics, and lifestyle affect individual pets. Life-stage labels and care tips are general information; consult your veterinarian for medical decisions.

Pet details on your device

Calculations run in your browser. Saved pet details, including names, birthdays, and resized photos, are stored in this browser on this device. Photos are not uploaded to our servers. You can remove saved pets using the calculator's controls. If you choose to share a result, its text or image contains the pet details you choose to share.

Optional reminders and site services

If you request email reminders, your email address, pet name, pet type, dog size, and birthday details are sent to our reminder service to calculate milestones and deliver emails. Subscription details and reminder history are stored by that service. You can stop future reminders using the unsubscribe link in an email.

The site uses Google Analytics and loads Google AdSense. These services may process usage and device information and use cookies. Advertising features depend on Google's approval, your settings, and applicable consent choices. Hosting providers also process operational logs. See our Privacy Policy for details about these services and your information.