Exact age in years, months and days on the test date, with completed months and decimal age for assessments and school readiness.
Defaults to today. Set it to the date the assessment is administered.
Put in the date of birth and a test date, and you get the exact chronological age in years, months and days. The tool also gives the years and months notation used on assessment forms, completed months and weeks, total days, and a decimal age.
This is the age measure used in clinical and educational assessments, where the age has to be exact on one specific test date.
How chronological age is calculated and written
Chronological age is just the exact time from the date of birth to the test date. Assessment forms usually want it written as years and months, like 7 ; 4, and the tool gives that to you directly. It also shows a decimal age, worked out on a 365.25-day year, which some standardised tests use to look up norms. The exact years, months and days figure is the unrounded value.
Frequently asked questions
What is chronological age?
It is the exact time that has passed from the date of birth to a given test date, usually written in years and months for assessments, like 7 ; 4.
How is decimal age calculated?
Decimal age is the total days between the two dates divided by 365.25. Some standardised tests use it to look up age norms, which is why the tool reports it alongside the exact age.
Can I calculate the age on a specific test date?
Yes. Just enter the test date and the chronological age is worked out as on that exact day, not today.