Age & Lifespan Calculators
Dog and cat years in human years, life stages and life expectancy. Each calculator shows its formula and its sources.
Dog Age Calculator
Dog years to human years by size, using the AAHA chart and the 2020 DNA formula.
Cat Age Calculator
Cat years to human years from the AAHA/AAFP chart, with the life stage.
Dog Life Expectancy Calculator
Typical lifespan for 49 breeds and mixed breeds, from a 2024 study of 584,734 dogs.