Exact age in years, months and days — plus the weekday you were born on, the countdown to your next birthday, your age on any chosen date, and the milestone dates people look up separately everywhere else.
Runs in your browser — nothing is uploaded
Defaults to today. Change it to work out an age on a past or future date — useful for eligibility cut-offs.
Optional — gives the exact age difference between two people
Age on 2026-08-02
36 years, 2 months, 18 days
Born on a Tuesday
286 days to your next birthday
Turning 37 on 2027-05-15, a Saturday.
13,228 days alive
1,14,28,99,200 seconds, if anyone asks.
Dates worth knowing, past and upcoming.
Not just today. Check an age against an eligibility cut-off, a past date or a future one.
The day you turn 10,000 days old, your billionth second, and the dates you turned 18, 21 and 60.
Real month lengths and leap years, counted forward — never the 'minus one day' that month-end subtraction produces.
Years, months, weeks, days, hours, minutes and seconds at once.
Pick your date of birth.
Change the 'as on' date if you need the age at some other point in time.
Optionally add a second date of birth to get the exact difference between two people.
Age looks like arithmetic and is not. Subtracting date fields and borrowing days breaks when months differ in length — from 31 January to 1 March, borrowing February's 28 or 29 days cannot cover a 31-day month, and naive implementations produce a negative day count.
This calculator counts whole months forward from the birth date instead, so the result is always the answer a person would give: in that case, one month and one day.
Someone born on 29 February has a real birthday only every four years, so tools have to choose a convention for the other three. This one treats 28 February as the anniversary in non-leap years, which matches most legal definitions and common date libraries.
Some jurisdictions use 1 March instead. If a date matters legally, check which convention applies rather than relying on any calculator.
Available tools are linked; the rest are in development.
We build internal tools, dashboards and automation that fit how your team works.