Online Chronological Age Calculator
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Pearson Borrow-30 Method
This calculator uses the Pearson borrow-30 method — the same calculation standard required by major standardized assessments including the CELF, PLS, GFTA, PPVT, and Goldman-Fristoe.
Unlike a simple date subtraction, the borrow-30 method handles month-length variations correctly: when the report day is smaller than the birth day, the calculator borrows 30 days (one month). When the report month is smaller than the birth month, it borrows 12 months (one year).
How to Use
- Report Date — the date of the evaluation or report. Defaults to today.
- Birth Date — the child or client's date of birth.
- Press Calculate Age or hit Enter to see the result.
Who It's For
Speech-Language Pathologists, school psychologists, occupational therapists, special education teachers, clinical psychologists, developmental pediatricians — anyone who administers standardized assessments and needs accurate chronological age.
Want It On Your Phone?
The Chronological Age Calculator app for iPhone, iPad, and Android has the same Pearson borrow-30 calculation. Completely free, no ads.
