Roman Numerals: How to Read and Write Them
Roman numerals appear on clocks, book chapters, movie copyright dates and monarchs' names. The system is logical once you learn the seven symbols and one key rule.
The seven symbols
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. You build numbers by combining them, largest to smallest, and adding: MMXXIV = 1000+1000+10+10+1+... Wait — that last part uses the subtraction rule.
The subtraction rule
To avoid four repeats, a smaller symbol before a larger one means subtract: IV = 4 (5−1), IX = 9, XL = 40, CM = 900. So 2024 = MMXXIV (MM=2000, XX=20, IV=4). This rule is the part people forget.
Convert instantly
Our free number to Roman numerals and Roman numerals to number converters handle any value — great for decoding that movie copyright year.
Bottom line
Learn the seven symbols and the subtraction rule (IV=4, IX=9, etc.) and you can read most Roman numerals on sight. For large or tricky ones, a converter saves the mental arithmetic.
