Age Calculator

Find your exact age in years, months and days from your date of birth, plus total weeks, days and hours lived and how long until your next birthday.

Date of birth

Age at the date

Frequently Asked Questions

Does the age calculator count leap years?

Yes. It uses real calendar dates, so February 29 and the varying lengths of each month are handled automatically when computing your exact age.

Can I calculate my age on a past or future date?

Yes. Change the "Age at the date" field to any date. Leave it on today to find your current age, or set a future date to see how old you will be.

What is my exact age?

Your exact age is shown as completed years, months and days, plus totals such as total months, weeks, days, hours and minutes lived.

Understanding the Age Calculator

The Age Calculator tells you exactly how old you are from your date of birth, broken down into completed years, months and days. Enter your birth date and, optionally, change the "age at" date to any past or future day. Beyond your exact age, it shows useful totals: the total number of months, weeks, days, hours and minutes you have lived. It also reveals the day of the week you were born and counts down to your next birthday, including which weekday it will fall on. Everything runs instantly in your browser using real calendar dates, so leap years and uneven month lengths are always handled correctly.

How it works

The calculator subtracts your birth date from the target date one unit at a time. It first finds the difference in days; if the target day is earlier in the month than your birth day, it borrows the actual number of days from the previous calendar month. If the target month is earlier than your birth month, it borrows 12 months and reduces the year count. This "borrowing" mirrors how you would do the subtraction by hand and guarantees calendar-correct results. Totals such as weeks, days, hours and minutes come from the real elapsed time between the two dates, so every leap day is counted exactly once.

years = endYear − birthYear; months = endMonth − birthMonth; days = endDay − birthDay (borrow a calendar month if days < 0, borrow 12 months if months < 0)

Worked example

Suppose you were born on 15 March 1990 and check your age on 21 June 2026. The day difference is positive (21 − 15 = 6 days) and the month difference is positive (June − March = 3 months), so no borrowing is needed: your exact age is 36 years, 3 months and 6 days. That works out to roughly 435 total months, about 1,892 weeks and around 13,247 days lived. You were born on a Thursday, and your next birthday on 15 March 2027 falls on a Monday.

Tips & common mistakes

Use the "age at the date" field to find your age on a future milestone, like a wedding or retirement date.
Leave the second date on today (the default) to get your current age right now.
Leap years are handled automatically because the tool uses real calendar dates, not a fixed 365-day year.
Month lengths differ, so "1 month" is not always 30 days — the day count reflects the actual months between your two dates.
If you see a validation error, check that your date of birth is not later than the "age at" date.
Use the export bar to copy your results, download a CSV, or save a PDF for records and forms.