---
title: "Age Calculator — Western Age vs Korean Age System Explained"
description: "Calculate your exact age in years, months, and days. Compare Western international age with the Korean traditional age system. Learn how Korea changed its age system in 2023."
url: "https://worldcalculators.org/calculators/age/"
canonical: "https://worldcalculators.org/calculators/age/"
---

# Age Calculator

Calculate your exact age in years, months, and days. Compare Western international age with the Korean traditional age system. Learn how Korea changed its age system in 2023.

## Quick answer

Korean traditional age = international age + 1 (or +2 if born after Jan 1 of your birth year). South Korea standardized to international age (만 나이 / Man Age) on June 28, 2023. Before that date, Koreans were legally 1–2 years older than their international age.

## The Three Korean Age Systems

Korea traditionally had three different ways of counting age simultaneously :
The traditional system where everyone is born at age 1 (counting the time in the womb as the first year of life) and everyone increases their age on January 1st, not on their birthday.

## Why Did Korea Change Its Age System?

In June 2023, South Korea enacted a law standardizing the international age system for all official uses. The reasons were largely practical:

Source: https://worldcalculators.org/calculators/age/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.