Chronological Age Calculator

Chronological Age Calculator is a free online tool that converts a date of birth into elapsed calendar time. It calculates exact age in years, months, days, hours, minutes, and seconds, then updates the display in the browser. The calculator also provides related information including birthstone, zodiac sign, birth flower, and total days alive.

The tool is designed for everyday calendar calculations, personal milestones, and preliminary administrative checks. It includes specialized calculators for testing scenarios, such as age at test date for clinical assessments, speech therapy evaluations, and child development screenings. The calculation is performed locally on the user's device using JavaScript; birth dates are never submitted to servers or included in page URLs.

The site explicitly states it is not a medical device, diagnostic service, legal authority, or official scoring tool. Assessment-age pages are reviewed by Xixuan Wang, a psychological counselor, to ensure explanations are clear and distinguish date arithmetic from professional judgment.