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Roman Numeral Converter

Convert between Roman numerals and Arabic numbers.

Runs locally · nothing uploaded

How to use this tool

1Type in a value and choose its starting unit.
2Read the converted value across every other unit instantly.
3No need to click convert — it updates as you type.

Frequently asked questions

How accurate are these conversions?

Conversions use standard, widely accepted conversion factors and are accurate to several decimal places for everyday use.

Can I convert more than one value at a time?

Each converter shows every common unit for the value you enter, so you can read off multiple conversions at once.

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