Roman Numeral Converter

Type a Roman numeral such as MCMXCIV, or a whole number such as 1994, and Roman Numeral Converter shows the integer and the Roman numeral side by side. Letters are not case-sensitive, so mcmxciv works too.

What you get
• Roman to integer: MMDCCCXCIV becomes 2,894
• Integer to Roman: 2,894 becomes MMDCCCXCIV
• Numbers from 1 to 3,999,999
• Overlined letters for values of 4,000 and above, in the standard overline notation
• A clear message for an invalid entry, with the valid range shown

Where it helps
• Reading years on buildings, monuments and book chapters
• Checking a Roman numeral on a clock face, a film credit or a sports event
• Converting section or list numbers in a document
• Learning how the Roman system works, with the reference table of I, V, X, L, C, D and M

Made for daily use
• Light and dark theme
• 28 languages, with right-to-left layout where it belongs

A new app
Built on the Calculator.io calculator engine. A More calculators link opens the full Calculator.io app, with 170+ tools for math, money, health and dates.

The app is supported by banner ads. Conversions follow the standard Roman numeral rules for the supported range.