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🏛️ Roman Numeral Converter
Convert between Arabic numbers and Roman numeralsConvert between Arabic numbers (1-3999) and Roman numerals. Supports bidirectional conversion with real-time validation and comprehensive rules display.
Arabic to Roman
Arabic Number:
XLII
Roman to Arabic
Roman Numeral:
42
Roman Numeral Rules
Basic Symbols
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
Combination Rules
IV = 4 (5-1)
IX = 9 (10-1)
XL = 40 (50-10)
XC = 90 (100-10)
CD = 400 (500-100)
CM = 900 (1000-100)
Examples
Arabic to Roman
1 → I
4 → IV
9 → IX
49 → XLIX
2024 → MMXXIV
Roman to Arabic
I → 1
IV → 4
IX → 9
XLIX → 49
MMXXIV → 2024
Roman numerals only support numbers from 1 to 3999. The conversion follows standard Roman numeral rules with subtractive notation.