Age calculator
Your exact age in years, months and days, how many days you have lived, the weekday you were born and the countdown to your next birthday.
Only used for people born on 29 February. Laws differ: 1 March is the usual rule in the United Kingdom and Hong Kong, 28 February in New Zealand and Taiwan. Check the rule that applies to you.
Result
36 years, 5 months, 3 days
On Sunday, 18 October 2026
Next birthday: Saturday, 15 May 2027, turning 37, in 209 days.
How it works
Age is counted the way birthdays work. Whole years are the number of birthdays passed; whole months are counted from the last birthday (when the day does not exist in a month, as 31 in April, the last day of that month is used); the days are what remains. Total days are the difference between the two calendar dates, weeks are days divided by seven, and hours and minutes are days times 24 and 1,440, because only dates (not times of birth) are used.
A 29 February birthday exists only in leap years: those divisible by 4, except century years that are not divisible by 400 (2000 and 2024 are leap years; 1900 and 2100 are not). In other years the birthday must be placed on 28 February or on 1 March. The calculator offers both and shows which one it used; the legal age of a person born on 29 February depends on the country.
Everything is calculated in your browser; nothing you type is sent or stored. The address of this page changes as you type so that you can copy it and share the same result.
Worked examples
Questions
Enter your date of birth. The calculator shows your age on today's date in years, months and days; change “Age on” to see it on any other date, past or future.
The “Total days” line is the number of days between your date of birth and the chosen date. Total hours and minutes are that number times 24 and 1,440.
In leap years on 29 February. In other years the birthday is celebrated on 28 February or 1 March, and laws differ by country. This calculator lets you choose either; the default is 1 March.
Yes. The date you type is used only in your browser. It appears in the address of the page so that you can share the result; nothing is sent to a server or stored.