Pets & Animal Care
Browse all 2 pets & animal care tools
What is pet calculators?
Pet calculators turn animal biology into numbers an owner can act on, such as converting an animal age into human-equivalent years, or working out a dose or a tank volume for the size of the animal.
Cat Age Calculator
Convert cat years to human years, and see the life stage from kitten to senior.
cat years to human yearscat age calculatorcat years
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Dog Age Calculator
Convert dog years to human years by breed size. See life stage and aging comparison.
dog years to human yearsdog age calculatordog years
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Formula & Methodology
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Did you know? The multiply-by-seven rule for dog years has no basis in biology. A 2020 epigenetic clock study found the relationship is logarithmic: a one-year-old Labrador is closer to a 30-year-old human, and the curve flattens sharply after that.
Sources
- American Veterinary Medical Association (AVMA): Life stage guidelines for dogs and cats
- Cell Systems (2020): Quantitative translation of dog-to-human aging by conserved methylation
Frequently Asked Questions
Not seven years per year. The current epigenetic formula is roughly 16 multiplied by the natural log of the dog age in years, plus 31, which makes the first year worth far more than any later one.
No. Smaller breeds generally live longer and age more slowly after maturity, while giant breeds reach old age several years earlier. The Dog Age Calculator accounts for weight class.
The first year counts for about 15 human years and the second brings the total to about 24, after which each year adds about 4. So a 10-year-old cat is about 56. Unlike dogs, cat size makes almost no difference, so one chart covers nearly every cat. The Cat Age Calculator does the conversion and names the life stage.
Aquarium volume, puppy adult weight, and feeding-amount calculators are planned for this category.