Draw a random Roman numeral from I to MMMCMXCIX, with its everyday number beneath it -- for reading practice, quizzes, and decoding clock faces and movie credits.
Roman numerals build numbers from seven letters -- I, V, X, L, C, D, M for 1, 5, 10, 50, 100, 500 and 1,000 -- added together from largest to smallest. Subtractive notation shortens four of the repetitions, so IV is 4 and IX is 9, a convention that only became standard in the Middle Ages; Romans often wrote IIII. The system has no zero and no place value, which makes arithmetic awkward and is much of why Hindu-Arabic numerals displaced it. It survives where numbers are labels rather than quantities: clock faces, book chapters, monarchs and film copyright dates.
This generator draws a random Roman numeral between I and MMMCMXCIX (1 to 3,999), showing the numeral large with its everyday number beneath it.
Every result here is drawn using crypto.getRandomValues() -- the Web Crypto API's cryptographically secure randomness -- instead of Math.random(), so it's genuinely unpredictable, not just statistically random. Learn more.
Use it for practicing reading Roman numerals, quizzing students, decoding clock faces, movie copyright years, and monument inscriptions, or picking a stylish number for a design.
Generate picks a whole number from your chosen range (up to 3,999, the largest number classical Roman notation can write) using the site's cryptographically secure randomness, then converts it with the standard subtractive rules (IV for 4, CM for 900).
Classical Roman numerals have no symbol above M (1,000), and convention repeats M at most three times. Larger numbers needed extensions like a bar over the numeral, which aren't part of the standard system.
Yes -- open the range settings to set any minimum and maximum between 1 and 3,999, for example 1 to 100 for practice with the small numerals or 1900 to 2026 for movie-credit years.
A smaller symbol before a larger one subtracts: IV is 4, IX is 9, XL is 40, XC is 90, CD is 400, CM is 900. Everything else simply adds from left to right.
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