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Roman Numerals - Free Online Roman Numeral Converter Tool | IconVault

Convert numbers to Roman numerals and back, live in your browser with a step-by-step breakdown. Handles 1 to 3999. Free, no signup.

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Roman Numerals

Two-way conversion between numbers and Roman numerals

5 of 5 free uses left
converts both ways, live

Breakdown

M + M + X + X + V + I

5 of 5 free copies left - everything runs in your browser.

Standard form only: subtractive pairs (IV, IX, XL, XC, CD, CM) are used, so 4 is IV and 9 is IX - not IIII or VIIII.

About this tool

IconVault's Roman Numerals converter translates Arabic numbers into Roman numerals and back again, instantly and live in your browser. It handles the full standard range of 1 to 3999 (I through MMMCMXCIX) and shows the subtractive-notation breakdown of every conversion, so you can see exactly how each result is built. Just type in either box and the other updates automatically.

Everything runs 100% in your browser with no server calls, no signup and no cost. Invalid input gets a plain-English explanation instead of a wrong answer: numbers outside 1 to 3999 are rejected, and malformed numerals like IIII are flagged. The honest note: classical Roman numerals have no zero and no values above 3999, so this tool sticks to the standard form used in dates, chapters, clock faces and copyright notices.

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