Age calculator
Your exact age, days lived and how long until your birthday
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What is Age calculator?
Enter your date of birth and you'll know your exact age in years, months and days. You'll also see how many months, weeks, days and hours you've lived.
It also tells you how many days are left until your next birthday, which day of the week you were born and when you turn (or turned) 10,000 days old. You can calculate how old someone will be on any date.
How to use it
- Enter the date of birth.
- Keep today's date or change “Age on date” to calculate it for another day.
- Read your age in years and the breakdown in months and days.
- Check your next birthday and the fun facts.
Advantages
- Exact age in years, months and days, not just completed years.
- Countdown to your next birthday and the age you'll turn.
- Calculates age on any past or future date.
- Free, no sign-up and no ads.
Technical details
Age is calculated by subtracting year, month and day between the date of birth and the reference date, borrowing days from the previous month when the day is smaller; dates are treated in UTC as calendar days. Days lived are the exact difference in days; weeks are that number divided by 7 (whole weeks); hours are days × 24 (approximate, without the time of birth). For people born on February 29, the birthday is taken as February 28 in non-leap years. The weekday of birth and the 10,000-day date are calculated with the Gregorian calendar.
Frequently asked questions
How old am I if I was born on a specific date?
Enter your date of birth and you'll see your completed years, along with the months and days since your last birthday.
How many days have I been alive?
The tool shows the exact number of days lived from your birth until today or the date you choose, plus approximate weeks, months and hours.
How long until my birthday?
Under “Next birthday” you'll see the days left, the date with its day of the week and the age you'll turn.
What if I was born on February 29?
In non-leap years, your birthday is considered to be February 28.
What day of the week was I born?
Under “Fun facts” you'll find the day of the week you were born and the full date.
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