Korean Age Calculator

Korean age (한국 나이) is a traditional age-counting system where everyone starts at age 1 at birth (representing the time spent in the womb), and everyone gains a year on 1 January rather than their individual birthday. South Korea officially abolished this system in June 2023 in favour of international age

The calculator uses the standard published formula for korean age. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: At birth: Korean age = 1. Each step in the calculation is shown so you can verify the result manually.