Blog
In-depth guides on chronological age calculation — for clinicians, educators, and parents.
Guides & How-Tos
Calculating Chronological Age
Complete guide to the ASHA 30-day borrowing method — formula, worked examples, and a free calculator.
How to Calculate Chronological Age
Step-by-step manual method, the ASHA 30-day borrowing rule, and common mistakes to avoid.
How to Calculate Chronological Age in Excel
DATEDIF formulas for exact age in years, months, and days. Works in Google Sheets too.
Chronological Age in Months
Convert exact age to total months — formula, worked examples, and quick-reference table.
Chronological Age and Prematurity (Corrected Age)
Understand the difference between chronological age and corrected age for premature babies.
Professional Use
Chronological Age Calculator for Speech Therapy
How SLPs calculate exact age for GFTA-3, CELF-5, PPVT-5, and other standardized assessments.
Chronological Age Calculator for Occupational Therapy
How OTs calculate age for Beery VMI, BOT-2, PDMS-3, and other OT assessments.
Chronological Age Calculator for Standardized Testing
How to calculate exact age for Pearson, Brigance, Bayley, and other assessment protocols.
Pearson Age Calculator
ASHA-compliant age calculation for Pearson assessment tools including CELF-5 and PPVT-5.
Child Chronological Age Calculator
Why exact age to the day matters in child assessment, school enrollment, and pediatric care.