🎂 Chronological Age Calculator: Exact Age in Years, Months, Days

How to use it

1. 1. Choose the date of birth

   Pick the date from the calendar or type it in the date box. A sample date is filled in so you can see a result straight away, and you can replace it with the real one.

2. 2. Check the second date

   The second date starts as today. Change it to find the age on another day, such as the date of a test, an enrolment cut-off or the first day of school. Press Use today to reset it.

3. 3. Press Work out the age

   You see the age in years, months and days in large numbers, then the total months, the total days and the date of the next birthday, written in the date style of your language.

4. 4. Read the notes on counting

   Months are counted from the birth day, and a short month uses its last day. A child born on 29 February has the birthday on 28 February in years without a 29th.

Ideas for class and home

• Age at a test date

  Assessments often give norms by age in years and months on the day of the test. Enter the child's birth date and the test date to get the exact figure to record.

• School entry cut-offs

  Check whether a child will be a given age on the first day of term or by a cut-off date, by entering that date as the second date and reading the years and months.

• Developmental and reading records

  Homeschooling parents and teachers who track milestones can note the age in months, shown as the total, when a skill first appears, and compare entries over time.

• A birthday countdown

  The tool gives the date of the next birthday and the number of days until it. A class can use this for a simple date lesson with real numbers that matter to them.