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Convertisseur de chiffres romains

Conversion des chiffres arabes en chiffres romains et vice-versa.

Écrire un nombre en Romain ou en chiffres arabes.

Partagez et discutez de la conversion des chiffres grecs et romains sur notre forum communautaire Technique.

Numbers in the Roman system are represented by the Latin letters I, V, X, L, C, D and M, corresponding respectively to the numbers 1, 5, 10, 50, 100, 500 and 1000. Roman numerals are read from left to right. To convert a Roman numeral and find its value, you should know that a symbol following a symbol of greater or equal value is added to the value of the latter (e.g. "VI" is 5+1 = 6), while if it precedes a symbol of higher value it subtracts from the value of the latter (thus "IV" is equal to 5-1 = 4). As each letter can only be repeated three or four times in a row (depending on the method used), this limits the possibilities of enumeration to 3999 or 4999 respectively. Beyond that, by placing a horizontal bar above the letters, we multiply their value per 1000 (the so-called vinculum system).

Examples of using the converter
Enter Arabic numerals: 832 → Resulting number: DCCCXXXII
Roman numeral input: MMXVII → Resulting number: 2017
Year entry: 2024 → Result in Roman numeration: MMXXIV.