How to use it
Choose the dates and inclusion options, then review the calendar and working-day totals separately.
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Lifestyle
Full Age Calculator
Calculate age from a birth date and reference date using the international birthday-based method.
26 years old
TOOL GUIDE
When to use it
Content reviewed · 2026-07-23
Calculate age from a birth date and reference date using the international birthday-based method.
Before you rely on the result
This is a simplified estimate. Check the original records or a qualified professional before an important decision.
Data handling
Values are used only on the current screen and are not sent or stored separately.
References대한민국 법제처 만 나이 안내
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