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

Pick your birth date and run the tool — it returns your exact age in years, months, and days, plus total days lived and a countdown to your next birthday. Free, no signup.

Enter your date of birth above and the tool computes your age as of today: full years first, then the remaining months and days, with leap years handled correctly.

What is a date of birth calculator?

A date of birth calculator turns a birth date into an exact age. This one shows years, months, and days separately (not just a year count), plus your total days lived.

How is age in years, months and days calculated?

Full years are counted first, then remaining months, then remaining days — borrowing days from the previous month when needed, using real month lengths and leap years. That is why the result is exact, not an estimate.

Does this show a birthday countdown?

Yes — the "Next birthday" result gives the date of your next birthday and how many days away it is. If today is your birthday, it says so.

Age Calculator — How Old Am I in Years, Months, Days

What is Age calculator?

Age Calculator — Calculate your exact age in years, months and days from your date of birth. Free age calculator with total days lived and a next-birthday countdown.

Age math uses the open-source age-calculator engine (mdmohsinhaider/age-calculator, MIT): full years, then remaining months, then remaining days, borrowing across month boundaries with correct month lengths and leap years (e.g. someone born Feb 29 ages correctly through non-leap years). Total days lived is the exact UTC day count between the two dates, and the next-birthday countdown uses the engine's ceiling-day math. Honest limitations: Feb 29 birthdays roll to Mar 1 in non-leap years for the countdown (standard Date rollover); age is computed as of today in UTC.

Why use this age calculator?

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Built for age calculator

Calculate your exact age in years, months and days from your date of birth. Free age calculator with total days lived and a next-birthday countdown.

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Transparent & honest

Age is computed as of today in UTC; results near midnight may differ by a day from your local timezone.

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Private by design

Everything runs in your browser. Your inputs never leave your device.

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Works everywhere

Fully responsive — perfect on desktop, tablet, and mobile. No app needed.

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Regularly updated

Regularly maintained and reviewed to ensure accuracy.

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Free forever

No accounts, no limits, no watermarks. Use Age Calculator as much as you need.

How to use Age Calculator

1Pick your birth date in the "Date of birth" field.
2Run the tool to get your exact age in years, months, and days.
3Read "Total days lived" for your age as a single day count.
4Check "Next birthday" for the date and a day countdown to your next birthday.
5Everything is computed in your browser — no signup, nothing uploaded.

What can you do with Age Calculator?

Calculate age from date of birth — Calculate your exact age in years, months and days from your date of birth.
How old am i today — Calculate your exact age in years, months and days from your date of birth.
Date of birth calculator — Calculate your exact age in years, months and days from your date of birth.
Age in years months days calculated — Calculate your exact age in years, months and days from your date of birth.

Good to know

Age is computed as of today in UTC; results near midnight may differ by a day from your local timezone.
Feb 29 birthdays count down to Mar 1 in non-leap years (standard calendar rollover).
Future birth dates are rejected — pick a date on or before today.

How it works

Age math uses the open-source age-calculator engine (mdmohsinhaider/age-calculator, MIT): full years, then remaining months, then remaining days, borrowing across month boundaries with correct month lengths and leap years (e.g. someone born Feb 29 ages correctly through non-leap years). Total days lived is the exact UTC day count between the two dates, and the next-birthday countdown uses the engine's ceiling-day math. Honest limitations: Feb 29 birthdays roll to Mar 1 in non-leap years for the countdown (standard Date rollover); age is computed as of today in UTC.

Examples

Adult birthday

Status: ok — exact years, months, days plus total days lived and next-birthday countdown.

Leap-day birthday

Status: ok — leap-year borrowing handled; countdown rolls to Mar 1 in non-leap years.

Recent birthday

Status: ok — works for any past date, including children's ages.

People also search for these — this tool handles them all:

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