Roman Numerals Converter
Convert numbers to Roman and back
Reference
I
1
1
V
5
5
X
10
10
L
50
50
C
100
100
D
500
500
M
1000
1000
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Free Roman numerals converter
Convert Arabic to Roman (1-3999) and back. Live, instant, bidirectional.
How to use this tool
- 1
Enter any number
1 to 3999 (standard Roman range).
- 2
Or enter Roman numerals
Like XIV, MMXXVI — we convert back to digits.
- 3
Both directions work live
Type in either box, the other updates.
Frequently Asked Questions
Max number?
Standard Roman: 3999 (MMMCMXCIX). For bigger, ancient Romans used bars above letters to multiply by 1000 — we don't support that.
Reference
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Smaller before larger = subtraction (IV = 4).
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