Dog Age Calculator
Forget the "times 7" myth. Use the new scientific formula.
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Why the "7 Year Rule" is Wrong
The old adage that one dog year equals seven human years is a massive oversimplification. Dogs mature incredibly fast in their first two years of life. A one-year-old dog is physiologically much closer to a 15-year-old teenager than a 7-year-old child.
The New Epigenetic Science
Recent studies from researchers at UC San Diego have looked at "DNA methylation"—chemical marks on DNA that change over time—to create a more accurate "epigenetic clock." The new formula uses a natural logarithm to track rapid early aging that slows down later in life.
Size Matters
Crucially, size is the biggest factor in aging. Small dogs (like Chihuahuas) live significantly longer and age slower after maturity than giant breeds (like Great Danes). This calculator adjusts the scientific formula based on the typical adult mass of the breed you select.