罗马数字转换
数字与罗马数字互转
🔒 100% client-side — your data never leaves this pageNumber or Roman
Results
Enter a number or Roman numeral
Quick Reference
I=1
IV=4
V=5
IX=9
X=10
XL=40
L=50
XC=90
C=100
CD=400
D=500
CM=900
M=1000
About this tool
输入 1–3999 的数字或罗马数字，工具自动识别格式并完成转换。包含罗马数字基础值快速参考表，同时输出序数词、二进制和十六进制格式。
Frequently Asked Questions
What numbers can be expressed as Roman numerals?
Standard Roman numerals represent numbers from 1 to 3999 (MMMCMXCIX). There is no Roman numeral for zero, and numbers above 3999 require non-standard notation.
What are the basic Roman numeral symbols?
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtraction rules apply: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.
Where are Roman numerals still used today?
Roman numerals appear in clock faces, movie sequel numbering, Super Bowl editions, chapter headings in books, building cornerstones, and formal outlines.