Roman Numeral Converter
Convert numbers to Roman numerals and back, from 1 to 3999.
Type a number to get its Roman numeral, or type a Roman numeral to get the number. Supports the standard range 1–3999 with proper subtractive notation. Runs entirely in your browser.
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Formula & methodology
Uses standard subtractive notation (IV, IX, XL, XC, CD, CM). Valid integers run from 1 to 3999.
Worked example
- 1994 → MCMXCIV
- XLII → 42
Frequently asked questions
Why is the maximum 3999?
Standard Roman numerals only use M, D, C, L, X, V and I, so the largest value without overlines is MMMCMXCIX (3999).
Privacy
All processing happens locally in your browser. Your data is never uploaded.