Kanji number converter

Convert digits to kanji numerals — standard or formal daiji — and parse kanji numbers back to digits.

Direction

Digits only — commas and spaces are ignored. Integers 0 to 99,999,999,999,999,999,999.

Converted in this browser. Nothing is sent anywhere.

Integers only — the 京 (10^16) place is the largest unit, so the maximum is 99,999,999,999,999,999,999. Standard style drops the leading 一 before 十百千 (千, not 一千); the formal daiji style keeps 壱 explicit and uses the common 大字 set (壱弐参肆伍陸漆捌玖拾佰阡萬). The reverse parser accepts both styles and mixed digit forms, but not positional notation like 一〇二 or fractions.

How to use

  1. Pick the conversion direction.
  2. Enter a number or kanji numeral.
  3. Convert and copy the result.

What it supports

Integers only, up to 9999京 (just under 10^20). Standard style omits leading 一 before 十百千; daiji uses 壱弐参… forms. Positional forms like 一〇二 and decimals are not supported.

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