How to use the Age Calculator
- Enter the date of birth.
- The Age on date is today. Change it to see the age on any other date, such as a deadline or an event.
- Read the exact age, the totals in months, weeks, days and hours, and the countdown to the next birthday.
How age is calculated
Age is counted in whole calendar years, then whole months, then the remaining days. Someone born on 15 March 2000 is 26 years, 6 months and 26 days old on 10 October 2026. Months have different lengths, so the day count is measured from the last "month birthday": if you were born on the 31st, the month is complete on the last day of shorter months.
Born on 29 February?
Leap-day babies have a real birthday only every four years. In other years this calculator counts the birthday on 28 February, which is what most people celebrate. Some countries legally use 1 March instead, which matters for things like driving age.
Handy uses
- Check an exact age for school, job or visa applications.
- Find how old someone was on a past date, or will be on a future one.
- Count the days until a birthday to plan a party.
Frequently asked questions
How do I calculate my age in days?
Enter your birthday and read <b>Days</b> in the totals. It counts every day from your birth date up to the chosen date.
Does it account for leap years?
Yes. Day, week and hour totals use the real calendar, including every 29 February.
Why is the Chinese zodiac only approximate?
The Chinese year starts at Lunar New Year, in late January or February. If you were born in January or early February, your animal may be the one for the previous year.
Is my birthday saved anywhere?
No. The calculation happens in your browser and nothing is stored or sent.