Age Calculator
Find your exact age in years, months and days from your date of birth.
What is an age calculator, and who needs it?
An age calculator tells you exactly how old you are today in completed years, months and days. Enter your date of birth and it also shows the total days you have lived and how many days are left for your next birthday.
In India, exact age matters more often than people expect. Government recruitment and entrance exam notices fix minimum and maximum age limits, school admissions depend on a child's age on a set date, and insurance, PF, passport and visa forms all ask for it. Students, job seekers, parents and HR teams use this tool to avoid counting mistakes.
Formula used
The calculator subtracts your birth date from today's date in three parts, borrowing like ordinary subtraction:
- Years = current year − birth year
- Months = current month − birth month
- Days = current date − birth date
If days are negative, reduce months by 1 and add the number of days in the previous month. If months are negative, reduce years by 1 and add 12. Total days lived = (today − date of birth) ÷ 86,400,000 milliseconds, rounded down.
Worked example
Take a date of birth of 15 August 2001 and today's date as 16 October 2026.
- Years: 2026 − 2001 = 25
- Months: 10 − 8 = 2
- Days: 16 − 15 = 1
Age: 25 years, 2 months, 1 day. Total days: 25 × 365 = 9,125, plus 6 leap days (2004, 2008, 2012, 2016, 2020, 2024), plus 62 days from 15 August to 16 October, giving 9,193 days. The next birthday, 15 August 2027, is about 303 days away.
Now try 25 August 2001 on the same date. Days: 16 − 25 = −9, so borrow one month: months become 1 and 30 days (September) are added, giving 21 days. Age: 25 years, 1 month, 21 days.
Frequently asked questions
How do I find my age as on a cut-off date for an exam or job?
This tool uses today's date. For a cut-off such as 1 August of the exam year, subtract your date of birth from that date using the formula above, and always confirm the rule in the official notification.
Does the age calculator count leap years?
Yes. Total days lived are calculated from actual calendar dates, so every 29 February between your birth and today is counted automatically.
Why does another website show my age differently by a day?
Tools handle month-ends and time zones differently. This calculator uses your device's current date and the previous month's length when borrowing days, so small differences are possible.
Do I need to sign up or share personal details?
No. You only enter a date of birth, and the calculation runs in your browser. There is no sign-up or login.
Can I use this result as proof of age?
No. It is a convenience tool. For official purposes use documents such as your birth certificate, school leaving certificate, Aadhaar or passport.
Limitations and accuracy
This calculator is meant for quick, everyday use. It relies on your device's date, so a wrong system date gives a wrong result. It does not use time of birth or time zones, so figures can differ by a day from other tools. It cannot replace the age shown on official documents.