Roman numeral converter

Convert formats and organize data

Enter an integer from 1 to 3999 or a canonical Roman numeral for reverse conversion. For example, 2026 is MMXXVI. Input is case-insensitive; noncanonical forms such as IIII, zero, negatives and fractions are rejected.

Check the input format and options with this example before using your own data. Random values, file sizes and presentation vary with the input and settings.