Dog age calculator
The “multiply by seven” rule is a myth. Dogs age fast early and then slow down, and the rate depends on breed size. This calculator uses a size-aware formula: the first year ≈ 15 human years, the second ≈ 9 more, then each later year counts for 4 to 7.5 human years depending on whether your dog is small, medium, large or giant.
Enter the age, pick the size group, and get a realistic human-equivalent age — all in your browser.