Date & Time

Age Calculator

Exact age from date of birth

Runs locally in your browser

Date of birth

As of date

How it works

Calculate exact age in years, days, and approximate months from a date of birth to any reference date.

Who it's for: Anyone filling out forms, planning milestones, or verifying eligibility by age.

Computes full years lived, accounting for whether the birthday has occurred in the reference year.

Shows total calendar days between birth date and the as-of date.

Provides an approximate month count using an average month length.

Enter your Date of birth.
Set As of date to today or any date you want age calculated for.
Read Years for full years, Days for total elapsed days, and Months (≈) for a rough month count.

If the birthday has not yet occurred in the reference year, full years will be one less than a simple year subtraction.