Roman Numeral Converter

Convert whole numbers to Roman numerals or translate Roman numerals back into standard numbers.

Preparing Roman Numeral Converter

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Input

Choose the conversion direction and enter either a whole number or a Roman numeral. This tool shows the result instantly without step-by-step output.

Input summary

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How to use Roman Numeral Converter

Pick the direction of conversion, and the calculator will translate the value between standard numeric form and Roman numeral notation.

This calculator is for outlines, event numbering, dates, historical references, and educational work involving Roman numerals.

Use uppercase Roman letters for the clearest input, especially when copying longer numerals.
Roman numerals follow subtraction rules such as IV and IX, so unusual character order may indicate an invalid entry.