Conversion Mode
Number
Date
Number Conversion
Enter an Arabic number (1-3999) or Roman numeral
Date Conversion
Enter a date (MM/DD/YYYY, YYYY-MM-DD, or a year)
Convert
Reset
Settings
Settings
Show step-by-step breakdown
Auto-detect input type (Arabic or Roman)
Uppercase Roman numeral output
Result
Step-by-Step Breakdown
Roman Numeral Reference
Arabic
Roman
1
I
4
IV
5
V
9
IX
10
X
40
XL
50
L
90
XC
100
C
400
CD
500
D
900
CM
1000
M