Ⅶ Roman Numeral Converter
Convert between Roman numerals and decimal numbers instantly. Supports values from 1 to 3,999.
Roman Numeral Converter
The Roman Numeral Converter translates between modern decimal numbers and ancient Roman numeral notation. Roman numerals are still used today in clock faces, book chapters, movie sequels, outlines, and formal documents. Understanding how to read and write them is a valuable skill.
This tool handles conversions in both directions. Enter a decimal number (1 to 3,999) to see its Roman numeral equivalent, or type a Roman numeral to get its decimal value. The converter validates your input and provides instant, accurate results.
Roman numerals use a combination of seven letters from the Latin alphabet: I, V, X, L, C, D, and M. The converter implements the standard subtractive notation rules, where smaller values placed before larger ones indicate subtraction (e.g., IV = 4, IX = 9).
Frequently Asked Questions
What are the basic Roman numeral symbols?
The basic symbols are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these symbols additively and subtractively.
Why is there a limit of 3,999 for Roman numerals?
Standard Roman numerals use a system where a symbol can repeat up to 3 times (e.g., III=3, but 4 is written as IV). The highest standard Roman numeral is MMMCMXCIX (3,999). Higher numbers require special notation.
How does subtractive notation work in Roman numerals?
Subtractive notation places a smaller value before a larger one to indicate subtraction: IV=4 (5-1), IX=9 (10-1), XL=40 (50-10), XC=90 (100-10), CD=400 (500-100), CM=900 (1000-100).