Dog Age Calculator
Enter your dog's age and approximate size category to see a rough human-age equivalent. This is a general estimate only — actual aging varies by breed, health, and environment.
How This Calculator Works
This calculator uses a simplified size-adjusted model. It does not use the simple "multiply by 7" rule, which is a popular misconception. Dogs age rapidly in their first two years — comparable to a human reaching young adulthood — and then continue aging at a rate that varies by size. Larger dogs tend to age faster and have shorter typical lifespans than smaller dogs.
The model used here is a general approximation. Actual aging varies considerably by individual breed, genetics, health, and environment. This tool should not be used to make veterinary or health decisions.
Last updated: May 7, 2025