How roman numeral converter works
Roman numerals use seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these symbols, usually from largest to smallest. When a smaller symbol precedes a larger one, it is subtracted (e.g., IV = 4, IX = 9).
This converter handles both directions. To convert a number to Roman numerals, it repeatedly subtracts the largest possible symbol value. To convert Roman numerals to a number, it scans the symbols left to right, adding or subtracting values based on the subtractive notation rule.
The standard Roman numeral system represents numbers from 1 to 3999. Numbers outside this range cannot be represented in standard Roman numerals. The converter validates input and rejects invalid combinations.