How to use the age calculator
- Enter the date of birth.
- Leave the second date as today to see your age now, or change it to find an age on any past or future date, for example on a wedding day or at retirement.
- Read your exact age in years, months and days, plus the totals in months, weeks, days and hours.
How exact age is calculated
We count whole years first, then whole months, then the remaining days. If the day of the month hasn't come round yet, we borrow the days from the previous month, which is exactly how you would work it out on a calendar. That means the result is right across leap years and months of different lengths.
People born on 29 February celebrate on 28 February or 1 March in years that aren't leap years. We count the next birthday as 1 March in those years, which is when the person legally turns a year older in many countries.
Age for forms and visas. Official forms usually want your age in whole completed years on a specific date, for example the date of application. Set the second date to that day to get the right answer.
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Fun facts the calculator shows
- Days lived: a 30 year old has lived about 10,950 days.
- Day of the week you were born: handy for the old rhyme about Monday's child.
- Star sign: worked out from the Western zodiac dates.
Need to count days between any two dates or add up hours? Try the time calculator. Planning a big birthday on a budget? The loan calculator shows what borrowing for it would really cost.
Frequently asked questions
How do I calculate my exact age?
Subtract your birth year from the current year, then adjust for whether your birthday has happened yet this year. For months and days, count the whole months since your last birthday and then the days left over. The calculator above does all of this for you.
How many days old am I?
Enter your date of birth above and the calculator shows the total number of days you have lived, as well as weeks, months and hours.
How is age calculated for someone born on 29 February?
In years without a 29 February, many countries treat 1 March as the birthday for legal purposes. The calculator counts the next birthday as 1 March in those years.
Can I find my age on a future date?
Yes. Change the second date to any day in the future, such as a wedding or retirement date, and the calculator shows how old you will be then.
Is this age calculator free?
Yes. It is free, needs no sign up and the dates you enter never leave your browser.
