Chronological Age Calculator - Exact Age in Years, Months & Days

Calculate exact chronological age in years, months and days for any date, plus total months, weeks and days. Free and offline.

Chronological Age Calculator finds the exact age between a date of birth and any other date, right from your Chrome toolbar. In one click you get the age in years, months and days, plus total months, total weeks and total days. It is useful whenever an accurate age is needed, such as for assessments, school records and forms. HOW TO USE 1. Click the extension icon in your toolbar. 2. Enter the date of birth. 3. Pick a reference date, or keep today's date. 4. Click Calculate Age or press Enter. FEATURES - Exact age in years, months and days - Total months, total weeks and total days - Any reference date: past, today or future; today is filled in automatically - Accurate calendar math for leap years, February 29 birthdays and month-end dates (for example January 31 to March 1) - Clear error messages for invalid dates or a birth date after the reference date - One-click Copy of the full result - Reset button to clear the form - Remembers your last date of birth for next time - Light and dark mode that follows your system setting, with a toggle that remembers your choice - Press Enter in any date field to calculate - Screen-reader friendly labels - Links to the full online calculator and a guide to calculating age by hand WORKS OFFLINE, NOTHING IS SENT All calculations happen inside your browser. The extension makes no network requests, needs no account and shows no ads. Your date of birth and theme choice are saved only in Chrome's local extension storage on your device and are removed when you uninstall the extension. MORE DETAIL For the test-manual Y;M;D format and a step-by-step breakdown, use "Open Full Calculator" to visit the free web version at chronoagecalculator.com. Please confirm dates against the source document for official testing, school or legal records.