Pet Age Calculator
How old is my pet in human years?
Dogs and cats on the veterinary life-stage scales rather than the seven-times folklore, which is wrong at both ends by years.
Questions people ask
The things that come up about pet age calculators, answered plainly.
Why is 'multiply by seven' wrong?
Because ageing is front-loaded. A one-year-old dog is closer to a fifteen-year-old human than a seven-year-old — it is sexually mature and nearly full-grown. Seven-times only happens to be right at about age four, and drifts either side of it.
Does size really matter for dogs?
A great deal. Small breeds live around 15 years and large ones around 11, and the difference is almost entirely after maturity: both reach adulthood at about the same age, then large dogs age faster.
Related tools
Exact ages, next birthdays, anniversaries and the odder age scales.
Dog Age CalculatorThe staged veterinary scale — 15 for the first year, nine for the second, then four to seven a year by size — with the 2020 DNA-clock figure beside it.
Cat Age CalculatorThe AAFP life-stage scale: 15 human years for the first, nine for the second, four a year after — and which stage that puts your cat in.
Age CalculatorYour age in years, months and days, worked out the way a birthday works — plus the totals in weeks, hours and seconds, and how long until the next one.
Date Difference CalculatorEnter two dates and get the gap in every unit at once — years, months and days as a person would say it, and the exact total in weeks, hours, minutes and seconds underneath.