Age Calculator

Exact age in years, months, days, weeks, and total days.

Date of birth

Age as of

About this calculator

Enter a date of birth and an "as of" date (defaults to today) to see the exact age in multiple units. The result includes years, months, and days; total months; total weeks; total days; and days until the next birthday.

How to use it

Enter the date of birth.
The Age as of date defaults to today — leave it or change it to calculate age at a different point in time.
Click Calculate Age.

Common uses

Verifying your exact age for official documents
Calculating age at a specific past or future date
Finding out how many days until a birthday
Age calculations for eligibility checks

FAQ

Can I calculate age at a past or future date?: Yes — change the "Age as of" field to any date, past or future.
How are months calculated?: Months are calculated calendar-accurately. For example, from January 31 to February 28 is one month, because February does not have a 31st.