13 tools
Age & anniversaries
Exact ages, next birthdays, anniversaries and the odder age scales. Each tool has its own page. It runs in your browser, and it keeps its inputs in the address bar so you can share the answer.
The tools
Find an exact age in years, months and days, the next birthday, the time since a date, an anniversary or a pet's age, all worked out in your browser.
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.
Exact Age CalculatorGive a birth date and time and get an age that keeps counting — years, months, days, hours, minutes and seconds, updating live.
Birthday CountdownA live countdown to the next one — days, hours, minutes and seconds, ticking down, with the weekday it lands on.
Next Birthday CalculatorThe date, the weekday, the days left to wait and the age it brings — plus the next six birthdays and which of them land on a weekend.
Anniversary CalculatorHow long since the date, which anniversary is coming, what it is traditionally called, and the exact day it lands on.
Days Since BirthdayDays elapsed since the most recent one, how far through the year you are, and the total days you have been alive.
Pet Age CalculatorDogs and cats on the veterinary life-stage scales rather than the seven-times folklore, which is wrong at both ends by years.
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.
Retirement Age CalculatorThe date you reach the age you are planning around, how long there is to go, and the same figure for a few ages either side of it.
Zodiac Sign CalculatorYour sign from your birth date, its element, quality and ruling planet — and a warning when your birthday sits on a cusp, where the answer genuinely depends on the year.
Chinese Zodiac CalculatorYour animal, element and yin-yang polarity from the sexagenary cycle — with Chinese New Year computed from the moon, so a January birthday gets the right answer.
Birth Day FinderThe weekday for any date, the rhyme that goes with it, and how the same date shifts across the years around it.