Age Calculator

Calculate exact age from date of birth

Enter a date of birth and an age-on date to calculate exact age in years, months, and days, then copy the result or share a stable link.

• Choose an age-on date so shared results stay reproducible
• See total days lived and days until the next birthday
• Compare exact age with a counting-age reference

Calculation basis

Age is calculated from the birth date and the selected age-on date in the browser. Recheck official rules for legal or administrative use.

Check the official age rule before submitting

Use the calculated age as a planning reference, then confirm the rule required by the school, employer, government office, insurance form, or travel document.

• Match the result to the rule used by the school, employer, government office, or form
• Use exact age for date-of-birth checks unless the form asks for a different convention
• Treat the counting-age reference as contextual, not a legal result