Why do Korean units advance every four digits?

Korean uses a myriad system shared with Chinese and Japanese, where each unit is 10,000 times the last: 만 is 10,000, 억 is 100 million, and 조 is one trillion. Western grouping every three digits does not match this.

What does the digit form like 1억2345만6789 mean?

It keeps Arabic digits but inserts Korean unit markers at each myriad boundary, a compact mixed notation common in Korean finance and news for reading large figures quickly.

Why is 일 sometimes dropped?

In standard Sino-Korean counting, 일 is omitted before 십, 백, and 천, so 1,000 is written 천 rather than 일천. The tool follows this so the Hangul reads naturally.

How large a number can it handle?

It supports values up to the 경 (10 quadrillion) range within JavaScript's safe-integer limit. Numbers beyond that are reported rather than mis-formatted.

Is my input sent to a server?

No. The conversion runs entirely in your browser with JavaScript, so the number you enter is never uploaded or stored.

Korean Large Number Formatter

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Korean groups large numbers every four digits using the units 만, 억, and 조, following the same myriad pattern as Chinese and Japanese. This tool converts a number into both the mixed digit form and a Sino-Korean Hangul reading.

How it works

The number is split into 4-digit groups from the right, and each non-zero group is tagged with its myriad unit:

만 = 10,000       (10^4)
억 = 100,000,000  (10^8)
조 = 1,000,000,000,000 (10^12)
경 = 10^16

Within each group the digits use 천 백 십 and the Sino-Korean numerals 일-구, and a leading 일 is dropped before 십, 백, and 천. So 123456789 becomes the digit form 1억2345만6789 and the Hangul 일억 이천삼백사십오만 육천칠백팔십구.

Example and notes

Entering 123456789 gives 1억2345만6789 and the Hangul reading above, with a space separating each myriad block as Korean convention prefers. The mixed digit form is the everyday way large numbers appear in Korean reporting and finance. All work is done in your browser, so your numbers stay private.