Age Calculator Online — Free Tool

Determine exact age based on date of birth, displayed in years, months, and total days.

Date of birth

As of

Years

Months

Days

Total days

7,305

Weeks (approx.)

1,043

Hours (approx.)

175,320

Note: Months/years are calendar-based. Total days/hours are based on the date difference.

Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

Exact age is more than years—it includes months and days for forms, eligibility, and milestones. Enter a date of birth and a reference date (often today) to get a precise breakdown.

Useful for school enrollment cutoffs, insurance quotes, and legal age verification planning.

Common use cases

School admission age cutoffs by exact date
Birthday countdowns in years, months, days
Eligibility checks for programs with minimum age
Genealogy and family history records

How to use

Enter the date of birth.
Set the 'as of' date or leave today as default.
Read age in years, months, and days.
Use total days for scientific or contractual age differences.

This page is available at /tools/age-calculator/.

Understanding the result

Years count full anniversaries; months and days are the remainder after larger units.
Leap years affect day counts when Feb 29 is involved.
Timezone at midnight can shift calendar dates—use consistent local dates for official forms.
Total days is useful for precise comparisons independent of month lengths.