Use this Roman numerals converter for whole numbers from 1 to 3999 and their Roman forms. Enter a decimal value (for example 2026) or a numeral (for example MMXXVI) in the box above, then press OK.

Each result page shows the Roman letters and the matching Arabic number. The list below links every value in order so you can open a conversion in one click.

Basic symbols: I (1), V (5), X (10), L (50), C (100), D (500), M (1000). Read symbols from left to right. When a smaller value stands before a larger one, subtract it (IV = 4, IX = 9, XL = 40). The same symbol may not repeat more than three times in a row.

For subtractive pairs, repetition limits, and worked examples, open the Roman numerals rules and examples guide.