Roman Numeral Converter
Convert between Arabic numbers and Roman numerals. Supports values 1 through 3999 with step-by-step conversion breakdown. 100% client-side.
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Quick Examples
Roman Numeral Values
I1
IV4
V5
IX9
X10
XL40
L50
XC90
C100
CD400
D500
CM900
M1,000
How to Use the Roman Numeral Converter
- Select your conversion direction: Number to Roman or Roman to Number.
- Enter a number (1-3999) or Roman numeral.
- Click Convert to see the result.
- Toggle Show Steps to see how the conversion works.
Roman Numeral Rules
- I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
- Subtractive notation: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900
- A smaller numeral before a larger one means subtraction
- Maximum standard value is 3999 (MMMCMXCIX)
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Disclaimer: This tool is provided as-is for informational and educational purposes only.