Age Calculator
Your exact age is the years at your last birthday plus the months and days since then. Born on 23 September 1998, you are 28 years, 5 months and 19 days old on 14 March 2027. Your date stays in your browser.
Only this tab holds your date. Close it and the date is gone.
| Date of birth | Exact age | Total days |
|---|---|---|
| 23 September 1998 | 28 years, 5 months, 19 days | 10,399 |
| 26 January 1995 | 32 years, 1 month, 16 days | 11,735 |
| 29 February 2004 | 23 years, 0 months, 14 days | 8,414 |
| 1 July 2008 | 18 years, 8 months, 13 days | 6,830 |
Using the age calculator
The Age on this date boxes already hold today's date when the page opens, read from your own device, so only the Date of birth boxes are empty. They take numbers: 8 for August, and all four digits of the year. Press Calculate age, or Enter in a year box, and this date of birth calculator answers under the buttons.
The Next birthday line looks ahead, with how many days are left. The Born on a line looks back at the weekday. The three totals say the same age again in months, in weeks and in days.
How to calculate age by hand
A wall calendar will check this DOB calculator. Put a finger on the second date and walk it back to a birthday. Here is the walk for someone born on 23 September 1998, who is 28 years, 5 months and 19 days old on 14 March 2027.
- Back to the nearest 23rd, the day of the month they were born on. 14 days reach the end of February and 5 more reach 23 February 2027: that is the 19 days.
- Back one 23rd at a time until the month is September. January, December, November, October and September make 5 hops to 23 September 2026: that is the 5 months.
- That date is a birthday, and 2026 less 1998 is the 28 years.
- A birth date from the 29th to the 31st needs one more rule: a month too short for that day uses its last day, as the section on months below shows.
Age on a cut-off date
The day you fill in a form often has nothing to do with the age it asks for. Its cut-off date decides that. Say the date is 1 July 2027: put 1, 7 and 2027 in the Age on this date boxes, and the answer is your age on that day. Use today puts today back.
The page stops at the date sum. Whether that age is allowed is up to whoever runs the form, and their rules may treat some applicants differently, so read them before you apply.
What the numbers mean
Here is each line of the answer for the same example: born on 23 September 1998, with 14 March 2027 as the second date.
- 28 years, 5 months and 19 days: the age as you would say it aloud. Years and months count only when complete, and what is left over moves down to the next part.
- Total months, 341: 28 years hold 336 months, and the 5 on top make 341.
- Total weeks, 1,485: 10,399 days in sevens, with the 4 days over left out.
- Total days, 10,399: the date of birth itself is not counted, and the second date is.
Born on 29 February
Take the 29 February 2004 row in the table. 2027 has no 29 February, so this page gives that person their 23rd birthday a day early, on 28 February 2027, and the 14 days on 14 March 2027 count from there. Some forms and laws use 1 March instead, so follow the rule of the form in front of you.
Months keep to the 29th all the same. 28 March 2027 still reads 23 years, 0 months and 28 days, and the first month is complete on 29 March 2027.
Why a month is not always 30 days
A month holds 28 days between 15 February and 15 March 2027, and 31 between 15 March and 15 April 2027. Both count as one month, because this page goes by the date on the calendar and not by a number of days.
A birth date near the end of a month needs one more rule, because a short month may not have that day. The month then ends on its last day, so one month after 31 January 2027 is 28 February 2027. On 1 March 2027 that baby is 1 month and 1 day old here. If another site's days differ from these for such a birth date, this rule is the likely reason.
Your date stays with you
This page has no form and no named box, and autocomplete is off, so your browser is not asked to remember a date of birth. The date sits in the open tab's memory while you work and never goes into the address, and our server gets no copy. Close the tab and it is gone.
Questions
How do I find my age from a date of birth?
Today is already in the Age on this date boxes, so only your date of birth is missing. Fill it in and press Calculate age. Your age today shows under the buttons.
What is a DOB calculator?
DOB is short for date of birth, a box on most forms. Give this page yours and it tells you how old you are on any later date.
Can I find my age on a past or future date?
Put that date in the Age on this date boxes, past or future. It only has to fall on or after the date of birth, and Use today puts today back.
I was born in 2003. How old am I?
The year alone leaves two answers. All through 2026 you are 22 until your birthday and 23 after it. Type the full date and the page settles it.
What is my age in days?
Look for the Total days line in the answer. Someone born on 23 September 1998 is 10,399 days old on 14 March 2027, and the line does the same sum for your date.
What day of the week was I born?
The answer names it, under Born on a. It comes from today's calendar, so very old dates may not match history.
What happens to the date I type?
It sits in the open tab's memory and goes when you close the tab. Our server gets no copy, and the address never shows it.
Is this age calculator online free?
Yes, with no sign-up. It works in the browser on a phone or a computer.
More to try
Play 2,000+ free games
Puzzle, racing, word, sports and two-player games that run in your browser, with no download.
See the free games
