Korean Age Calculator
International Age (Man Nai)
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Korean Age (Se-neun)
Traditional social age (1 @ birth, +1 Jan 1)
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Year Age (Yeon Nai)
Current Year - Birth Year (0 @ birth, +1 Jan 1)
Understanding the Systems
📜 Note on 2023 Law Change: As of June 2023, South Korea officially adopted the
"International Age" (Man Nai) for most legal and administrative purposes. However, the traditional "Korean
Age" is still commonly used in social settings.
$$ \text{International} = \text{Current} - \text{Birth} \text{ (Adjust for birthday)} $$
$$ \text{Korean (Traditional)} = (\text{Current Year} - \text{Birth Year}) + 1 $$
$$ \text{Year Age} = \text{Current Year} - \text{Birth Year} $$