Developer•Free tool
Roman Numeral Converter – Number to Roman & Back
Convert numbers to Roman numerals and Roman numerals back to numbers. Supports values up to 3999.
No sign-upBrowser-based
DEV
Tool
Enter your values and get results instantly.
HOW
How to Use
- 1Type a number (e.g. 2026) or a Roman numeral (e.g. MMXXVI)\n2. The other format is shown instantly\n3. Copy the result
WIN
Benefits
Both directions supported
Up to 3999
Instant live conversion
Copy with one click
Free and private
FAQ
Frequently Asked Questions
How do Roman numerals work?
Roman numerals use combinations of I, V, X, L, C, D and M. Smaller values before larger ones subtract (IV = 4), after they add (VI = 6).
Why is the maximum 3999?
Traditional Roman numerals have no standard symbol for 5,000, so 3999 (MMMCMXCIX) is the practical upper limit.
Is 0 or negative supported?
No — Roman numerals have no zero or negatives, so those inputs are shown as invalid.