Age Calculator (2026)

Enter your date of birth to get your exact age in years, months and days, your total days lived, and a countdown to your next birthday.

How Old Am I? Find Your Exact Age

Date of birth

Age at date (starts as today — change it to find an age on any other day)

Your exact age

Day of the week you were born

Total days lived

Total weeks lived

Total months lived

Next birthday

Days until your next birthday

February 29ths lived through

Ages are worked out on calendar dates, the same way official forms count them: you turn a year older at the start of your birthday. If you were born on February 29, in years without a February 29 this calculator counts your birthday on March 1.

How the Calculator Works

Exact age is a subtraction problem with borrowing, just like school arithmetic. Subtract the birth day from the target day, the birth month from the target month, and the birth year from the target year. When the day subtraction goes below zero, borrow the days of the month before the target date; when the month subtraction goes below zero, borrow twelve months from the year.

Age = target date − date of birth (borrowing days and months as needed)
Total days = calendar days between the two dates
Total weeks = total days ÷ 7 | Leap days = every February 29 between the two dates

Worked Example: Born June 15, 1990, Checked on October 29, 2026

Result	How it is worked out	Answer
Exact age	2026-10-29 minus 1990-06-15, borrowing as needed	36 years, 4 months, 14 days
Day of the week born	June 15, 1990 on the calendar	Friday
Total days lived	Calendar days between the two dates	13,285 days
Total weeks lived	13,285 ÷ 7	1,897 weeks and 6 days
Total months lived	36 × 12 + 4 completed months	436 months and 14 days
Next birthday	Next June 15 after the target date	Tuesday, June 15, 2027 (turning 37)
Days to next birthday	October 29, 2026 to June 15, 2027	229 days
February 29ths lived through	1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020, 2024	9

Why Your Exact Age in Days Matters

Whole years are enough for birthday cards, but plenty of official cutoffs run on exact dates. School enrollment often turns on whether a child is five on one fixed date in September. Retirement plans, pensions, and benefits each have their own qualifying birthdays, and some are measured to the day. Travel rules price infants and children by their age on the day of the flight, not the day you booked. Setting the age-at date above to any of those cutoff dates gives you the exact answer those forms are really asking for.

Frequently Asked Questions

Subtract your birth date from the target date in three parts: days, then months, then years. If the day result is negative, add the number of days in the month before the target month and take one month away. If the month result is negative, add twelve and take one year away. The worked example above shows every step.

Enter your date of birth above and the calculator shows the weekday instantly. It works because calendar dates map to fixed weekdays: every date lands on one specific day of the week, and counting the days from a known anchor date gives the answer for any birthday, past or future.

Count every calendar day between your birth date and today, including leap days. A 36-year-old has lived roughly 13,000 to 13,300 days depending on how many February 29ths fall inside the span. The calculator counts your exact total, and also breaks it into weeks and completed months.

In years without a February 29, this calculator counts your birthday on March 1, which matches how the age subtraction works out on paper. Some countries and some families celebrate on February 28 instead, and official rules vary by place and purpose, so check the rule that applies to your form or document.

Yes. Change the age-at date to any day on or after the birth date: the first day of school, a wedding day, a retirement date, or the deadline on a form. The exact age, totals, and next-birthday countdown are all worked out as of that date instead of today.

The calculator counts every February 29 that falls between your birth date and the target date, including February 29 itself if you were born on it. Most people live through one leap day roughly every four years, so a 36-year-old has usually seen nine of them.

Disclaimer: Results are calendar-date calculations for information and planning. Official bodies may count age differently for specific purposes — for example, some use February 28 for February 29 birthdays — so confirm the rule on any legal, medical, or government form that depends on an exact age.