How is exact age calculated?

By counting full years, then remaining months, then remaining days — the same way you count age on a birthday.

Why does my age in days differ from a simple multiplication?

Months have different lengths and leap years add an extra day every 4 years (with exceptions). This calculator accounts for all of that.

Age Calculator

Quick answer: Enter your birthdate to see your exact age and days until your next birthday.

Enter your date of birth to instantly calculate your exact age in years, months, and days — plus your total age in weeks and days, and a countdown to your next birthday.

Last reviewed: April 2026Report an error

Date of Birth

As of Date

Age

36 yrs 4 mo 18 d

You are 36 years, 4 months, and 18 days old — 13,287 days total (1,898 weeks). Next birthday in 227 days.

Total Days

13,287

Total Weeks

1,898

Next Birthday

227 days

Next Birthday Date

Jan 1, 2027

How to Use This Age Calculator

1Enter your date of birth.
2Optionally enter a custom "as of" date (defaults to today).
3Read your exact age in years, months, and days.
4See your total age in weeks and days, and your next birthday.

Frequently Asked Questions

: By counting full years, then remaining months, then remaining days — the same way you count age on a birthday.
: Months have different lengths and leap years add an extra day every 4 years (with exceptions). This calculator accounts for all of that.

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Age Calculator

How to Use This Age Calculator

Frequently Asked Questions

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