Math & Science
Roman Numeral Converter
Convert between Roman and Arabic numerals
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-08
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Roman Numeral Converter do?
It helps you convert between Roman and Arabic numerals.
What inputs do I need?
Enter Conversion, Roman numeral, and Arabic number.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
Use this Roman Numeral Converter to convert a value quickly and consistently. Provide Conversion, Roman numeral, and Arabic number and it returns Roman numeral and Arabic number.
If you are comparing results across tools, keep the same units and the same level of precision. The displayed value may be rounded, so copy more decimal places when you need a tighter match.