Enter your dog's actual age and select breed size to convert to human years using science-based formulas. Ditch the "multiply by 7" myth β different breed sizes age at significantly different rates. No signup, data stays local.
Result
How the Science Works
The American Veterinary Medical Association (AVMA) recommends size-based conversion formulas:
2 yrs = 24 human yrs
Each yr after = +4
2 yrs = 24 human yrs
Each yr after = +5
2 yrs = 24 human yrs
Each yr after = +6~7
FAQ
How old is a 1-year-old dog in human years?
A 1-year-old dog is equivalent to a 15-year-old human. This applies to all breed sizes β small, medium, and large β because dogs develop much faster than humans in their first year, going through the equivalent of infancy to adolescence in just 12 months.
What is the formula for converting dog years to human years?
The science-based formula varies by breed size: Small dogs (<10kg) = Year 1: 15 + Year 2: 9 + each additional year: 4; Medium dogs (10-25kg) = Year 1: 15 + Year 2: 9 + each additional year: 5; Large dogs (>25kg) = Year 1: 15 + Year 2: 9 + each additional year: 6-7. The simple multiply-by-7 method has been debunked by science.
Do different dog breeds age differently?
Yes. Small dogs develop similarly to large dogs in puppyhood but age more slowly as adults, leading to longer lifespans. Large dogs age faster in adulthood and reach senior years earlier. A 7-year-old large dog may be equivalent to a 50-year-old human, while a small dog of the same age is only about 44 in human years.
Why not just multiply by 7?
The multiply-by-7 rule is outdated and inaccurate. Dogs don't age at a constant rate: the first year equals about 15 human years, the second adds 9, and each subsequent year adds 4-7 years depending on breed size. The rule also completely ignores the significant difference in aging rates between small and large breeds.