How to use the Age Calculator
- 1
Enter your date of birth.
- 2
Leave the second date as today, or change it to the date you need your age on, such as a form's cut-off date.
- 3
Read your exact age in years, months and days at the top of the results.
- 4
Check the totals, the day of the week you were born and the countdown to your next birthday.
How your exact age is counted
The method is the same one you would use with a wall calendar. First count the full years since your birth date, then the full months after your last birthday, then the days left over.
Say you were born on 15 August 1990 and you want your age on 9 November 2026. Your last birthday was 15 August 2026, when you turned 36. From 15 August to 15 October is two full months. From 15 October to 9 November is 25 days. So your age is 36 years, 2 months and 25 days.
The calculator also counts the total days between the two dates, which here is 13,235. Divide by 7 and you get 1,890 full weeks and 5 days. Hours are shown as days × 24, so they are approximate, since nobody records the minute of birth on a form and the calculator does not ask for it. And 15 August 1990 was a Wednesday, which you will see in the results.
Month-end and leap-year birthdays
Months do not all have the same length, and that is where many quick calculations go wrong. This tool follows a clear rule: when the matching day does not exist in a month, the last day of that month is used instead.
- Born on 31 January: on 28 February of the same year you are counted as exactly 1 month old, and on 1 March you are 1 month and 1 day old. On 31 March you are 2 months old.
- Born on 29 February: in a non-leap year your birthday is taken as 28 February. So someone born on 29 February 2000 turned 1 on 28 February 2001, and the results note when this adjustment applies.
- Leap days are counted correctly in the totals, so the total-days figure across four years includes the extra day.
Some laws and organisations treat 1 March, not 28 February, as the birthday in non-leap years. If an official age matters for a leap-day birthday, check the rule the authority uses. The difference is one day.
Age as on a cut-off date for exams and jobs
Government recruitment notices, entrance exams and school admissions in India almost always state age limits "as on" a specific date, and that date is often not the day you apply. A candidate who is 31 years 11 months on the closing date of the form may be 32 on the cut-off date, or the other way round. Set the second date in the calculator to the exact cut-off mentioned in the notification.
Read the wording carefully. A limit of "not more than 32 years" usually means you must not have crossed your 32nd birthday on that date. Many central government posts allow age relaxation for reserved categories, commonly 3 years for OBC and 5 years for SC and ST candidates, but the exact relaxation is set in each notice. The date of birth that counts is the one recorded in your Class 10 certificate or birth certificate, so use that and not the date you celebrate.
Completed years and the "running" year
In many Indian homes people say someone is "running" their next year of age. A person aged 36 years and 2 months has completed 36 years and is in their 37th year. Forms, passports and legal documents always ask for completed years, which is the number this calculator shows first. The next-birthday line tells you which age you are heading towards.
Why another site might show a different answer
Age calculators disagree by a day more often than you would expect. The cause is almost always one of these rules:
| Reason | What happens |
|---|---|
| Month length rule | Some tools count every month as 30 days or 30.44 days, which can shift the days figure by one or two. |
| Leap-day birthdays | A tool using 1 March for 29 February birthdays will show one less day of age until then. |
| Inclusive counting | Counting both the start and end date adds one day to the total. |
| Time zone | If a site uses server time, "today" may already be tomorrow or still yesterday in India. |
This calculator reads today's date from your own device, uses the month-end rule described above, and does not count the birth date itself as a day you have lived.
Everything is calculated in your browser. Your date of birth is not sent anywhere or stored, which is worth knowing because a full date of birth is personal information you should not hand out casually.
Frequently asked questions
How do I calculate my age from my date of birth?
Count the full years from your birth date to today, then the full months since your last birthday, then the remaining days. Enter your date of birth above and the calculator does this instantly, including month-end and leap-year cases.
How do I find my age on a specific date?
Change the "Age on this date" box from today to the date you need, for example the cut-off date in a job notification. The results update right away. Tap Use today to switch back.
How is age calculated for someone born on 29 February?
In leap years the birthday falls on 29 February as usual. In other years this calculator treats 28 February as the birthday. Some legal systems use 1 March instead, so check the rule if an official age is involved.
How many days old am I?
Enter your date of birth and look at the Total days figure. It counts every day from your birth date up to the chosen date, including the extra day in each leap year.
Can I find out which day of the week I was born?
Yes. The results show the weekday of your birth date, along with the weekday your next birthday falls on.
Why does it say the date of birth is after the age date?
The date of birth must be on or before the date you are calculating age on. Check the year, since it is easy to pick the wrong one in a date picker on a phone.
Last updated on November 9, 2026