Age calculator · datestool.com

Date of birth

Age on

Enter a date of birth to calculate age.

What this calculates

This age calculator works out exactly how old someone is in years, months, and days, plus the total count in weeks, days, hours, and minutes. Enter any date of birth and optionally change the reference date to calculate age at a specific point in time.

Common uses

Checking exact age for official forms, eligibility checks, or insurance applications.
Finding out how many days old you are, or celebrating a milestone like 10,000 days.
Calculating a child's age in months for medical or developmental reference.
Working out age at a past or future date for planning purposes.

How it works

Age is calculated using the most widely used Western convention: age increases on the birthday each year. For people born on 29 February, the next birthday in a non-leap year falls on 28 February. The total days, weeks, hours, and minutes figures are exact counts from midnight on the date of birth.