Roman Numeral 変換
「Roman Numeral 変換」はコード、データと QRに使えるブラウザツールです。入力内容と結果は通常この端末内で処理され、登録は必要ありません。
使い方
使い方
- Enter a whole number from 1 to 3999 or a Roman numeral such as MMXXIV.
- Convert the value and review the equivalent notation.
- Copy the result when you are ready to use it.
Standard notation from I to MMMCMXCIX
The converter accepts canonical Roman numerals from I (1) through MMMCMXCIX (3999). It uses standard subtractive pairs such as IV, IX, XL, XC, CD, and CM, and rejects non-standard repetitions or combinations.
Whole numbers only
Roman numerals do not have a universally agreed standard for zero, negative values, fractions, or numbers above 3999 in this focused converter. Enter decimal digits for a number or the letters I, V, X, L, C, D, and M for a numeral.
Private browser conversion
Parsing, validation, conversion, and copying happen locally in your browser. Your value is not uploaded or stored by this page.
よくある質問
あわせて知りたいこと
What range is supported?
Values from 1 through 3999 are supported, covering I through MMMCMXCIX.
Which subtractive forms are allowed?
The standard pairs IV, IX, XL, XC, CD, and CM are accepted.
Can I convert zero or negative numbers?
No. This converter is limited to positive whole numbers because standard Roman numeral notation does not provide one consistent form for zero or negative values.
Does the conversion happen online?
No. The conversion runs entirely in your browser.