How to Convert to or from Roman Numerals
Enter any number between 1 and 3999 into the field labeled Arabic number. The calculator will convert the number into a Roman numeral.
You can also enter Roman numerals (letters M, D, C, L, X, V, and I) into the field labeled Roman number. The calculator will convert it into an Arabic number.
What Are Roman Numerals?
- Roman numbers and numerals – how do they work?
- Learn more about the Roman calendar
Help and Example Use
API Services for Developers
Date Calculators
- Time and Date Duration – Calculate duration, with both date and time included
- Date Calculator – Add or subtract days, months, years
- Weekday Calculator – What day is this date?
- Birthday Calculator – Find when you are 1 billion seconds old
- Week Number Calculator – Find the week number for any date
Related Links
- Calendar & Holidays Overview – Explore calendar tools
- Calendar Generator – Create a calendar for any year
- The World Clock – Current time all over the world
- Countdown to Any Date – Create your own countdown
