Pet Age Calculator (Dog & Cat Years)
NewConvert your dog or cat's age into human-equivalent years using scientifically-informed non-linear formulas, not the oversimplified "×7" myth.
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human-equivalent years
Frequently Asked Questions
Why not just multiply by 7?
The "1 dog year = 7 human years" rule is a popular myth that doesn't match how dogs actually age — dogs mature much faster than humans in their first couple years, then age more slowly afterward. This calculator uses a more accurate non-linear formula instead of the flat multiplier.
What formula does the dog calculation use?
Human age = 16 × ln(dog age) + 31, based on a 2020 UC San Diego study that compared DNA methylation patterns ("epigenetic clocks") between dogs and humans — this logarithmic formula matches the rapid early aging and slower later aging that the flat ×7 rule misses entirely.
What formula does the cat calculation use?
Common veterinary aging charts estimate a cat's first year as roughly 15 human years, the second year adding about 9 more (24 total by age 2), then roughly 4 human years for each year after that — reflecting a similar fast-then-slower aging pattern to dogs, though cats and dogs age somewhat differently overall.
Does breed or size affect the result?
Not in this calculator — in reality, larger dog breeds tend to age faster and have shorter lifespans than smaller breeds, so a precise age comparison would also factor in breed size. This tool gives a general estimate applicable across typical breeds rather than a breed-specific calculation.