Speechies Chronological Age Calculator

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.
• The result updates automatically as you change either date — no submit button.

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.

Why AI Doesn't Cut It

Generic age calculators (ChatGPT, Google "how old is…") use calendar-day math or fractional years — neither matches what test manuals require. Read the breakdown →