Dog Age Calculator
Use this dog age calculator to estimate dog years in human years with a size-aware educational model. Individual dogs age differently, so use it as a general life-stage reference.
Equivalent human age
28 yrs
Currently: Adult
A size-aware educational model
Veterinary life-stage guidance informs this page. The conversion is Pet Aging Hubโs simplified estimate, not an official AVMA formula or a clinical assessment.
How Does the Dog Age Calculator Work?
The old "1 dog year = 7 human years" rule is a myth. A 1-year-old dog is equivalent to a 15-year-old human, and by age 2 that jumps to 24 human years. After that, each dog year adds roughly 4 human years.
Conversion Formula
Small: year 1 = 15; year 2 = 24; then +4/year
Medium: year 1 = 15; year 2 = 24; then +5/year
Large: year 1 = 15; year 2 = 24; then +6/year
Giant: year 1 = 12; year 2 = 22; then +7/year
Breed, genetics, health, weight, and lifestyle can change how an individual dog ages. See our dog aging by breed and size guide for context.
Methodology note: veterinary life-stage guidance is used as context; Pet Aging Hub defines the conversion model above. It is not an official AVMA conversion formula.
Dog Life Stage Reference Chart
Puppy โ Young adult (โ15 yrs)
Young adult (15โ28 human yrs)
Adult (28โ52 human yrs)
Senior (52โ68 human yrs)
Geriatric (68+ human yrs)
Frequently Asked Questions
Does breed size affect when a dog becomes a senior?
At what age does the senior life stage begin?
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Disclaimer: This calculator provides a general educational estimate, not veterinary advice, diagnosis, or treatment. Your dogโs breed, health, body condition, and lifestyle can affect aging.