Age Calculator — How Old Am I?
How old is someone born on…
Today, or any past or future date
Exact age
Enter a date of birth to see the exact age in years, months, and days.
Next birthday
The countdown to the next birthday appears here.
Milestones ahead
Upcoming birthdays and day counts, such as 10,000 days old.
In short
How the Age Calculator works
Your exact age is the number of full years, then full months, then remaining days between your date of birth and the target date. This calculator counts calendar dates in your local time zone, not elapsed hours, so time zones and daylight saving cannot shift the result by a day.
Guide
How exact age is calculated
The calculator counts the complete years since your date of birth, then the complete months after that, then the days left over. It works on calendar dates in your own time zone rather than on elapsed hours, so a time zone or a daylight-saving change can never move your age by a day.
Totals in hours, minutes, and seconds assume 24-hour days and start at midnight on your date of birth, so they are a whole-day approximation of the time you have been alive.
Guide
How month ends and February 29 are handled
| From | To | Result | Why |
|---|---|---|---|
| Jan 31 | Feb 28 (common year) | 1 month, 0 days | February has no 31st, so its last day completes the month |
| Jan 31 | Mar 1 (common year) | 1 month, 1 day | One complete month to Feb 28, plus one day |
| Feb 29, 2000 | Feb 28, 2001 | 1 year, 0 days | In common years a Feb 29 birthday falls on Feb 28 |
| Feb 29, 2000 | Feb 29, 2004 | 4 years, 0 days | Leap-year birthdays fall on the day itself |
| Mar 15 | Mar 14 next year | 11 months, 27 days | The birthday has not been reached yet |
Guide
How do I calculate the days between two dates?
Open Days between dates and pick a start and an end date. The result shows the number of days and the same span in years, months, and days. By default the end date is not counted, the way you would count nights in a hotel stay. Tick Include the end date to count both the first and the last day, as for a booking that runs through the end date.
Guide
Why do age calculators disagree?
Months have different lengths, so two calculators can split the same span differently. Some count 30-day months, some convert from total days, and some treat the end of a month differently. This calculator always counts whole calendar months, and the table above shows exactly how it treats the cases where tools differ.
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Questions
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth. The calculator counts complete years, then complete months, then the remaining days up to today, or up to the date you choose.
Can I find my age on a specific date?
Yes. Change the “Age on” date to any past or future date, for example a deadline for an age-limited application.
How many days old am I?
The results show your age as total days, as well as total weeks, months, hours, minutes, and seconds.
How does the birthday countdown work?
It finds your next birthday after the target date and shows the date, the weekday it falls on, and the number of days left.
Which weekday was I born on?
The results include the day of the week of your date of birth.
Why do age calculators sometimes disagree?
Month lengths differ. From January 31 to February 28, some tools say one month and others say 28 days. We count a month as complete only when the same day-of-month is reached, or the last day of a shorter month. People born on February 29 turn a year older on February 28 in non-leap years.
Sources
Method and review
The method is described on this page and every result shows how it was reached. Last reviewed by the PurePDF team. Spotted a mistake? Tell us.
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