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Roman Numeral Converter
Two-way converter between standard Arabic numbers (1-3999) and Roman numerals (I, V, X, L, C, D, M) with subtractive notation.
🏛️ Two-Way Roman Numeral Converter
Instantly convert between standard Arabic numbers (1–3,999) and Roman numerals.
Type any number from 1 to 3,999
Standard subtractive notation (I, V, X, L, C, D, M)
Additive & Subtractive Decomposition
M(1,000)
+M(1,000)
+X(10)
+X(10)
+V(5)
+I(1)
=2,026Primary Base Numerals
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
Standard Subtractive Pairs
IV
4
IX
9
XL
40
XC
90
CD
400
CM
900
What are Roman Numerals?
The ancient Roman numeral system uses letters from the Latin alphabet: I, V, X, L, C, D, and M.
Formula & Step-by-Step Calculation
I=1, V=5, X=10, L=50, C=100, D=500, M=1000
Subtractive combinations such as IV (4), IX (9), XL (40), XC (90), CD (400), CM (900).
Worked Step-by-Step Examples
Example 1
Convert 2026
Solution: MMXXVI
• 2000 = MM, 20 = XX, 6 = VI ⟹ MMXXVI
Common Real-World & Academic Use Cases
- ✓ Copyright dates on film credits
- ✓ Super Bowl and Olympic event numbering
- ✓ Clock faces and monumental inscriptions
How to Use the Roman Numeral Converter
1
Enter Value
Type number or Roman numeral.
2
Read Conversion
Inspect bidirectional result.
Frequently Asked Questions
Q: What is the maximum standard Roman numeral?
3999 (MMMCMXCIX).