Roman Numeral Converter

Convert standard Roman numerals to numbers and back.

Handle values from 1 through 3,999 using canonical Roman forms.

Your inputs stay on your device

Convert Roman numerals

live result

Number

From

Result

MMXXVI

Conversions run locally and reject malformed input rather than guessing.

Context & Reference

For reading or writing standard Roman numerals.

converter guide

Builds canonical numerals or validates and sums a numeral.

Use this converter with your own values, then review the clearly labelled result and copy it when you need it elsewhere.

Output is either the Roman form or its decimal value.

Convert 2024 to MMXXIV.

Supported decimal values run from 1 through 3,999.

This converter runs locally in this browser. Supported decimal values run from 1 through 3,999.

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