Assessment Age Calculator

Chronological age for psychoeducational assessments. 30-day months. Year / Month / Day output.

A simple, fast chronological age calculator built for school psychologists and assessment professionals. Enter a test date and date of birth to instantly calculate the student's exact chronological age in the standard Year / Month / Day format used on official assessment forms. Features: - 30-day month convention used by major assessment manuals (WISC, WIAT, Vineland, and others) - Clean Year / Month / Day output matching official form formatting - For students under 6 years old, total months are also displayed - Dates entered in Year / Month / Day order for consistency - No internet connection required — works completely offline - No data collected or stored assessment age calculator! Disclaimer: This extension is a calculation tool only, not a substitute for professional judgment or official test manuals. Always verify results before using them in an official assessment. Use is at your own risk. No personal data is collected or stored.