Roman Numerals
Type a number (1–3999) to get its Roman numeral, or paste a Roman numeral to convert back — with a quick reference chart of the letters.
FAQ
What's the highest Roman numeral?
Standard notation reaches 3999 (MMMCMXCIX) — larger numbers need overline notation, which isn't commonly used.
Why is there no zero?
Romans had no symbol for zero; their numeral system is additive and subtractive, not positional.
Are lowercase Roman numerals accepted?
Yes — input is case-insensitive, so xiv and XIV both convert to 14.