Dog Age Calculator
Convert your dog's age into human years using an accurate nonlinear formula.
How This Works
The old "multiply by 7" rule is outdated. This uses the more accurate nonlinear model: a pet's first year of life is roughly equivalent to 15 human years, the second year adds about 9 more, and each year after that adds a smaller amount (about 5 for dogs, 4 for cats) — reflecting how pets mature quickly early on and age more gradually afterward.
Formula
Example
A 5-year-old dog is about 15 + 9 + (3 × 5) = 39 human years. A 5-year-old cat is about 15 + 9 + (3 × 4) = 36 human years.
Frequently Asked Questions
How old is a 3-year-old dog in human years?
Approximately 29 human years.
Is the "multiply by 7" rule accurate?
No — it's an oversimplification. Pets mature much faster in their first two years than the ×7 rule suggests, then age more slowly afterward.