Age Calculator
Your precise chronological age, total days lived, the weekday you were born, and a countdown to your next birthday.
Tip: set "age as of" to a form’s cutoff date (for example 1 January) to check eligibility for exams and applications.
How exact age is calculated
Chronological age is measured in completed units: full years first, then full months, then leftover days. Someone born on 15 March 2000 is, on 10 March 2026, exactly 25 years, 11 months and 23 days old, because the 26th year has not yet completed. This is the convention used on government forms, competitive exam eligibility rules, and medical records worldwide.
Age on a cutoff date
Many applications ask for your age "as on" a specific date: 1 August for an exam, 31 December for a sports category, the date of travel for airline child fares. Change the second field to that cutoff date and the readout gives the legally relevant answer. This avoids the common off-by-one mistake of computing age today when the rule wants age on the cutoff.
Why months make it tricky
Months have 28 to 31 days, so "one month after 31 January" is ambiguous. This calculator follows standard calendar arithmetic: it borrows the actual length of the previous month when the day-of-month goes negative, matching how banks compute tenure and how courts interpret age statutes.
What else you get
Alongside the exact age you see total months, weeks, days and hours lived, the day of the week you were born, and the number of days to your next birthday, so the tool doubles as a birthday countdown.
Worked example: exam eligibility
A notification says candidates must be between 21 and 30 years as on 1 August 2026. If you were born on 12 July 1996, set date of birth to 12-07-1996 and "age as of" to 01-08-2026: the result is 30 years and 20 days, which exceeds the limit, so you are ineligible even though you were 29 for most of the application window. This exact scenario, an age crossing the boundary between the application date and the cutoff date, is the most common eligibility mistake, and it is why the "as of" field exists.
Age for school admission, insurance and sport
School admissions typically require a minimum age as on 31 March or 1 June of the academic year. Life and health insurance premiums are banded by "age nearest birthday" or "age last birthday" depending on the insurer, and the readout gives you both your completed age and days to the next birthday so you can tell which band you fall in. Youth sports categories (under-14, under-19) use age on a fixed date, usually 1 January, and the same two-field method answers those instantly.
Frequently asked questions
How is age calculated in years, months and days?
Count completed years from your birthday, then completed months, then the remaining days. The calculator does this with real calendar lengths, so results match official forms and exam eligibility rules.
How do I check my age on a specific cutoff date?
Change the "age as of" field to the cutoff date mentioned in the notification (for example 01-08-2026). The readout then shows your age exactly on that date.
What day of the week was I born?
Enter your date of birth and the readout lists the weekday you were born, along with your total days lived and your next birthday.
Does the calculator account for leap years?
Yes. All arithmetic uses the real calendar, including 29 February. If you were born on 29 February, your next birthday is counted to 28 February in non-leap years.