Free Roman numeral converter for numbers 1-3999: instantly converts any number to standard Roman numerals with a numeral chart and date examples like MMXXIV.
Roman numerals are still everywhere: movie release years, clock faces, event titles, graduation dates and tattoo designs. Converting a number like 1999 to MCMXCIX by hand is easy to get wrong, especially with the subtractive rules (4 is IV, not IIII).
This roman numeral converter does it instantly for any number from 1 to 3999. Type your number and the result appears in standard subtractive notation, the same style used in most modern contexts.
Students use it to check homework, editors and designers use it for dates and captions, and anyone planning a date tattoo can verify the exact year before committing. The chart and FAQ below explain the rule behind each symbol.
Enter a number between 1 and 3999 — the Roman numeral updates immediately. Try 1999 to see MCMXCIX.
Split the number into thousands, hundreds, tens and units, then map each part with the rules above (4 = IV, 9 = IX, 40 = XL, 90 = XC, 400 = CD, 900 = CM). Example: 1999 = 1000 + 900 + 90 + 9 = M + CM + XC + IX = MCMXCIX.
Roman numerals use subtractive notation: a smaller symbol before a larger one means subtraction, so IV = 5 - 1 = 4. Clocks sometimes show IIII, but IV is the standard in modern writing.
Traditional Roman numerals go up to 3999 (MMMCMXCIX). Larger values need a bar above the symbol to multiply by 1,000, which is rarely used on websites, so the converter covers 1-3999.
Convert the day, month and year separately. For example, 10 August 2026 = X (day 10) / VIII (month 8) / MMXXVI (year 2026), separating the parts with slashes.