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Roman numeral converter

Convert Roman numerals and integers in either direction, including dates or delimited lists.

Get started

  1. Use the example values or enter your own measurements.
  2. Calculate, then copy the result or download the available details.

Example

Input

MCMXCIX

Expected result

1999

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

The converter uses standard subtractive pairs such as IV and CM. An overline multiplies a group by 1,000. Enter an underscore before each overlined letter, or paste the overline itself. Values are limited to 1–3,999,999. Date mode converts each field and preserves separators.

Calculation mode

Single value
  • Integer or Roman numeral
Date or list
  • Values or date