HomeFree Calculators — Free Online Calculator ToolsPet Age Calculator Pet Age Calculator ???? Pet Age Calculator Find your pet’s age in human years Pet Type Dog Cat Pet’s Age (years) Dog Size Small (under 20 lbs) Medium (21-50 lbs) Large (51-90 lbs) Giant (over 90 lbs) Calculate Human Age Equivalent ⚠️ This uses modern veterinary research showing pet aging isn’t linear (the old “multiply by 7” rule is outdated). Actual aging varies by breed, genetics, and health. Consult your veterinarian for health guidance specific to your pet’s life stage.