How to use the Roman Numeral Converter

Type a number (e.g., 2026), a Roman numeral (e.g., MMXXVI), or a full date in YYYY-MM-DD format (e.g., 1985-07-13). The converter auto-detects what you typed and shows the result. For dates, you get each part (year, month, day) converted separately.

Pourquoi cet outil est important

Roman numerals appear everywhere modern design wants timeless gravitas: building cornerstones, monument inscriptions, Super Bowl numbering, book chapter headings, royal lineage, and the copyright dates on every movie credit roll. Tattoos and wedding bands are the most common personal use — having a tool that handles dates cleanly saves a lot of hand-conversion mistakes.

Cas d'utilisation courants

• Wedding date tattoos and engraved jewelry
• Anniversary cards and gifts
• Movie title cards and end credits
• Chapter headings in books and presentations
• Building cornerstones and monument inscriptions
• Copyright year on legal pages
• Super Bowl, Olympic, and historical event numbering

How Roman numerals work (the short version)

Seven Latin letters represent values: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Smaller before larger means subtract (IV = 4); smaller after larger means add (VI = 6). For numbers above 3,999, traditional notation adds a bar (vinculum) over the letter to multiply by 1,000 — which our tool produces correctly.

Foire aux questions

Can I convert dates?
Yes. Type a date in YYYY-MM-DD format and the converter will display year, month, and day as three separate Roman numerals.

What is the maximum number?
Standard Roman numerals max out at 3,999 (MMMCMXCIX). For larger numbers we use the vinculum (overbar) convention which multiplies by 1,000 — supporting up to 3,999,999.

Why is 4 IV and not IIII?
Subtractive notation (IV) is the standard form taught in schools and used in modern publishing. The additive form (IIII) does appear on clocks for visual balance but is technically incorrect.

Is zero a Roman numeral?
No. The Roman system has no symbol for zero — the concept arrived in Europe via Arabic mathematics centuries later. Our converter will return an error if you enter 0.