Age Calculator
Today by default. Change it to find an age on any date.
Exact age
Enter a date of birth to see the exact age.
How to use the Age Calculator
- Enter a date of birth. Type it or pick it from the calendar.
- The age is worked out for today. To find an age on another date, such as a deadline or an anniversary, change the “Age on” date.
- Use Copy to copy the age, or Reset to start again.
Examples
- Born 14 March 2000, on 16 October 2026: 26 years, 7 months and 2 days. That is 319 months, 1,387 weeks and 3 days, or 9,712 days. The 27th birthday is on Sunday, 14 March 2027.
- Born 31 January 2000, on 29 February 2000: exactly 1 month, because February has no 31st and its last day completes the month.
- Born 29 February 2004, on 28 February 2026: exactly 22 years. In years without a 29 February, the birthday is counted on 28 February.
How the exact age is calculated
The calculator counts the way people do. It first counts the complete years since the date of birth, then the complete months after the last birthday, then the days left over. For example, from 14 March 2000 to 16 October 2026:
- The last birthday was 14 March 2026, so that is 26 complete years.
- From 14 March to 14 October 2026 is 7 complete months.
- From 14 October to 16 October is 2 days.
Simply dividing the total number of days by 365.25 gives slightly wrong answers near birthdays, because months and years have different lengths. Counting calendar months avoids that.
Months of different lengths
When a start date falls on a day that a later month doesn’t have, such as the 31st, the month is complete on that month’s last day. The same rule means a 29 February birthday falls on 28 February in common years, which is also how many legal and banking systems treat it. Some countries use 1 March instead.
Time zones
The calculation uses plain calendar dates, with no times. “Today” is taken from your device’s clock, so the answer always matches your local date and never shifts because of daylight saving time.
Frequently asked questions
Is my date of birth stored or sent anywhere?
No. The calculation runs in your browser. Your date of birth is not sent to a server, saved or tracked, and it is cleared when you leave the page.
How do I calculate my age on a specific date?
Change the “Age on” field to the date you need, such as the start of a school year, a sports registration deadline or a retirement date. The age, totals and next birthday update straight away.
How old is someone born on 29 February?
They gain a year every year like everyone else. In common years this calculator counts the birthday on 28 February, so they turn a year older on the last day of February.
Why does my age in weeks show extra days?
Few ages are an exact number of weeks, so the remainder is shown as days. For example, 9,712 days is 1,387 weeks and 3 days.
Does it count the day of birth?
The day of birth is day zero, as it is for ages in everyday use. A baby is 1 day old the day after it is born and 1 year old on its first birthday.
What about Korean or East Asian age counting?
This calculator gives the international age used for legal documents in almost every country, including South Korea since 2023. Traditional systems that count from 1 at birth will give a higher number.
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