TetraKits
The TetraKits Roman Numeral Converter runs entirely in your browser — free, private, and ready on mobile or desktop.
Overview
Roman numerals appear on clock faces, Super Bowl titles, and book chapter headings — but subtractive notation (IV, IX, XL) trips up even history buffs. Enter a number or numeral and get the correct conversion instantly.
How to use the roman numeral converter
Convert Arabic numbers to Roman numerals or decode Roman numerals to decimal — switch direction, enter a value, and see the result instantly for dates, outlines, and trivia.
Common use cases
Convert Arabic numbers to Roman numerals or decode Roman numerals to decimal — switch direction, enter a value, and see the result instantly for dates, outlines, and trivia. Bookmark the tool for quick access during projects.
FAQ
What is the largest Roman numeral?
Standard notation covers 1–3,999. Larger numbers use vinculum (overline) notation not supported here.
Is IIII valid for 4?
Subtractive IV is standard. IIII appears on some clock faces but is non-standard in modern notation.
Can I convert years like 2024?
Yes. 2024 = MMXXIV — common for copyright dates and movie credits.
What about lowercase roman numerals?
Enter uppercase (MMXXIV) or lowercase (mmxxiv) — both decode correctly.
Is this Roman numeral converter free?
Yes. Unlimited conversions with no signup.
