About Roman Numeral Converter
Convert between Arabic numbers (1, 2, 3…) and Roman numerals (I, V, X, L, C, D, M). Useful for education, outlines, or clock faces. Supports 1–3999 in both directions. All conversion runs in your browser.
Frequently Asked Questions
What range of numbers is supported?
Standard Roman numerals support 1 to 3999. Numbers outside this range are not converted (Roman notation did not use zero or larger forms in the classic system).
Is my input sent to a server?
No. Conversion is done entirely in your browser.
How do I convert Roman to number?
Select "Roman to number" and paste or type Roman numerals (e.g. XIV, MCMXCIX). The tool will output the Arabic number.