How Old Is My Dog in Human Years?
Direct answer: Your dog’s age in human years depends mainly on size. The old “multiply by 7” rule oversimplifies aging. Using common educational charts, year 1 is roughly 12–15 human years, year 2 reaches about the mid-20s, then each later dog year adds about 4–7 human years—more for large and giant breeds. Use the calculator below for an approximate, size-based estimate.
Calculate your dog’s human age
Example ages (medium dog, approximate)
Illustrative mid-size values from our educational chart. Large/giant dogs often map higher after early adulthood; small dogs often map lower.
Want every size at once? See the full chart or dog age by size.
Why isn’t it just ×7?
Dogs mature much faster in puppyhood than a flat 7:1 ratio suggests, then aging speed varies by body size. Organizations and educational posters (AVMA-style summaries, AAHA charts, AKC explainers) therefore use curved or size-banded tables instead of one multiplier.
FAQ
How old is a 7-year-old dog in human years?
Roughly the mid-40s to mid-50s depending on size (for example ~44 small, ~47 medium, ~45 large, ~56 giant on our educational table). Always approximate.
How old is a 2-year-old dog in human years?
Often about 22–24 human years on common charts—far more than “2×7=14.”
Does breed matter more than size?
Many public charts band by size (weight class). Breed can correlate with size and longevity, but this site uses size bands only—no breed medical claims.
Is this veterinary advice?
No. Educational estimates only.