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Age Calculator

Exact age today or on any date, down to the day

  • Runs in your browser
  • No sign-up
  • Free forever
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How to use the Age Calculator

  1. 1

    Enter a date of birth. The age today appears straight away as years, months and days.

  2. 2

    To find an age on another day, change the Age on date or press 1 January next year, which is handy for school or sports cut-off dates.

  3. 3

    Read the totals in months, weeks, days, hours and minutes, the date of the next birthday with a countdown, and the weekday you were born on.

  4. 4

    For a 29 February birthday, choose whether it is celebrated on 28 February or 1 March in common years. The age changes on that day.

  5. 5

    Press Copy link to share the result; the link opens with the same dates.

Features

  • Exact age in years, months and days on any date, not only today
  • Totals in months, weeks, days, hours and minutes
  • Next birthday with a day countdown and the age you turn
  • Weekday of birth, Western zodiac sign and Chinese zodiac animal
  • Life milestones such as 10,000 days and 1 billion seconds, with their dates
  • A choice of 28 February or 1 March for leap-day birthdays
  • Shareable links that keep the dates in the address
  • Calculated on calendar dates, so time zones never shift the answer

Age in years, months and days

Most people know their age in years. Forms, contracts and milestones often need more: the exact age on a particular date, how many days until the next birthday, or whether someone had turned eighteen on the day a document was signed. This calculator answers those questions precisely, and shows its working as totals you can check.

Ages are counted the way people and most official rules count them. A year passes on each birthday, a month passes on the same day of the next month, and the remaining days are counted after that. When a month is shorter than the birth day, for example a birthday on the 31st, the calculator borrows days from the previous month so the result stays consistent.

Leap-day birthdays

Someone born on 29 February has a real birthday only once every four years. Legally they still age every year, and countries differ on which day counts in a common year. The United Kingdom and New Zealand use 1 March for many legal purposes; many people celebrate on 28 February. The setting changes the exact day the age increases and the next-birthday countdown.

To count the days, weeks or business days between any two dates, use the Date Difference Calculator. To convert a birth date to a Unix timestamp or another time zone, the Timestamp Converter does that.

Frequently asked questions

How is exact age calculated?
Whole years are counted from your last birthday, then whole months from that date, then the days left over. Someone born on 15 May 1990 is 36 years, 4 months and 18 days old on 3 October 2026. When the target day of the month is earlier than the birth day, the days are borrowed from the month before, the convention used by most official calculators.
How old is someone born on 29 February?
They gain a year every year, not every four. In common years the birthday is usually observed on 28 February, and some jurisdictions use 1 March. Pick the rule you need and the age, the next birthday and the countdown all follow it.
Can I calculate an age on a date in the past or the future?
Yes. Change the Age on date to any day after the birth date. This is useful for cut-off dates in school admissions, sports age groups, insurance quotes and visa rules, which often ask for the age on a specific day such as 1 January or 31 August.
Why do the totals not include the time of birth?
The calculator works on calendar dates, so hours and minutes are counted from midnight on the birth date. If you know the exact time and need hour-level precision, use the Between dates mode with times switched on.
Is the Chinese zodiac animal exact?
It follows the Gregorian year. The Chinese New Year falls between 21 January and 20 February, so anyone born in January or early February may belong to the previous year's animal. Check the exact New Year date for your birth year if it matters.
Is my date of birth stored or sent anywhere?
No. The calculation runs in your browser. Your dates are kept in this device's local storage so the page remembers them, and in the address only when you copy the link yourself.

Last updated .