What Are Roman Numerals?
Roman numerals are a number system from ancient Rome that uses letters: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, and M = 1000. Values are generally added from left to right, but a smaller symbol placed before a larger one is subtracted, as in IV = 4 and IX = 9.
Subtraction Rules
Only I, X, and C are used subtractively, and only before the next two larger symbols: IV, IX, XL, XC, CD, CM.
Example
2026 = MMXXVI.
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Last updated: September 27, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.