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Age Calculator

Find your exact age in years, months and days — plus the total days, weeks and months lived. Enter your date of birth and the calculator shows your precise age, whether you want today's figure or an age as of any past or future date. Everything runs privately in your browser.

Date of birth

Age as of

What is an age calculator?

An age calculator works out exactly how old a person is by measuring the time between a date of birth and a chosen reference date, usually today. Instead of giving just a year, it returns a precise figure in years, months and days, so you can say 'I am 31 years, 8 months and 9 days old' rather than a rounded 'about 31'. It also sums the total time lived in days, weeks and months, which surprises many people. The calculation is exact because it counts every real day between the two dates, leap years included, so it is not an approximation. People use an age calculator for everything from filling in forms and applications to birthdays, retirement planning and recording how long someone has been alive. Because it runs entirely in your browser, your date of birth never leaves your device.

Example

A person born on 1 January 1995, aged as of 7 September 2026, is 31 years, 8 months and 9 days old. The calculator also reports about 380 total months, 1,653 total weeks and 11,572 total days lived.

Who is this age calculator for?

An age calculator is genuinely useful to almost anyone, but a few groups reach for it most often — and each one tends to ask a slightly different question.

Students and young adults: an age calculator for students checks your exact age for school admission, exams and applications that ask for a precise years-months-days figure rather than a rounded one.
Couples: couples use the years, months and days breakdown to mark anniversaries, count the days since a first date, or plan a big milestone together.
Salaried professionals: turning your age into completed years matters for retirement planning, job applications and time-sensitive forms that need a verified number.
Retirees: a quick age check helps seniors confirm eligibility dates for benefits, pensions and milestone checks on a specific reference date.

Age chart — your age as of 1 January 2026

This reference table uses the same years-months-days method and the same day and week conversions as the calculator above, all worked out as of 1 January 2026.

Date of birth	Age (years, months, days)	Total days	Total weeks
21 Mar 1965	60 years, 9 months, 16 days	22,201	3,171
15 Jun 1980	45 years, 6 months, 20 days	16,636	2,376
1 Jan 1995	31 years, 0 months, 0 days	11,323	1,617
9 Sep 2000	25 years, 3 months, 24 days	9,245	1,320
31 Dec 2010	15 years, 0 months, 1 day	5,480	782

Common use cases

Checking your exact age for a form, visa or application.
Finding an age as of a past date or an anniversary.
Counting down to a birthday or a big milestone.
Recording total days or weeks lived for a celebration.

Pro tips

Use the 'Age as of' field to check eligibility on a past or future date.
The total-days figure includes leap days, so it is the true count.
For a precise answer, count years, then months, then days in that order.
Set the 'Age as of' box to today for the most current figure.

How to use

Enter your date of birth.
Leave the second field as today, or pick a date to age as of.
Click Calculate age to see your exact age and the total time lived.

Age Calculator FAQs

How do I calculate my age from my date of birth?

Enter your date of birth and the calculator works out your exact age in years, months and days.

How does the age calculator work?

It counts full years between the two dates, then the remaining months, then the leftover days. The result is exact, not rounded.

Does it account for leap years?

Yes. Because it counts every real day between the dates, leap years are included automatically.

How do I calculate my age in days?

The calculator reports total days lived, counted day by day, so leap days are all included too.

How do I calculate the age between two dates?

Change the 'Age as of' box to a past or future date and the calculator finds the elapsed years, months and days.

Why does my age differ between some calculators?

Different tools round differently — some give only years, others count exact days. Counting years, months and days in order is the precise method.

Can I check my age as of a future date?

Yes. Set the 'Age as of' field to any date to see what your age will be then.

What is chronological age?

Chronological age is the actual amount of time elapsed since birth, measured in years, months and days — the figure this calculator gives.

What counts as a day when I calculate my age?

Each full 24-hour period counts as a day. Days are counted between the same time on both dates, so the result is fair at either end.