Dog Age Calculator & Birthday

Understand your dog's age without relying on the old “multiply by seven” rule.

Dog Age Calculator & Birthday is a focused, offline dog age calculator for owners who want a clear view of chronological age, estimated human age, life stage and the next birthday.

SIZE-AWARE HUMAN AGE

The first two dog years mature faster. After that, the estimate adjusts for small, medium, large or giant dogs because adult size affects how quickly dogs age.

USEFUL FOR PUPPIES

Young dogs are shown in weeks through their first six months, making the result easier to use for puppy milestones.

KEEP EVERY DOG ORGANIZED

• Save multiple dog profiles
• Add an exact or estimated birthday
• Include breed and personal notes
• Color-code each profile
• See the next birthday countdown
• Switch between US, day-first and device date formats
• Hide the human-age estimate if you prefer
• Share a dog's age with family and friends

PRIVATE AND OFFLINE

The app requires no account and no Internet connection. Dog names, birthdays, breeds and notes remain on your device. There are no ads, analytics or tracking tools.

Human-age and life-stage results are educational estimates and do not replace advice from a veterinarian.