Dog Age Calculator: Lifespan

Find out how old your dog is in human years, which life stage it has reached, and how long common breeds typically live.

• Enter age in years and months, or pick a birth date
• Get a human-age estimate for small, medium, large, or giant dogs
• See the life stage, from puppy to senior, and when senior care usually begins
• Browse the full age chart for your dog's size, with the current year highlighted
• Senior dogs past 16 years get an extended estimate from a logarithmic ageing curve, and ages above the oldest verified dog trigger a double-check warning
• Compare typical lifespan ranges for 15 common breeds
• Pick a breed to set the size and see its typical lifespan
• Save your dogs with a name and birth date to see each one's age and next birthday
• Share the result as a short text summary
• Your last entry is remembered for next time

Estimates follow published veterinary age charts and life stage guidelines. Every dog ages differently, so ask your vet about your dog's care.