--- title: "Roman Numeral Converter - Numbers to Roman | CanDoYa" description: "Free Roman numeral converter: turn numbers into Roman numerals and Roman numerals back into numbers (1-3999), instantly in your browser with the worked breakdown." url: https://candoya.com/tools/roman-numeral-converter/ locale: en type: browser-tool --- # Free Roman Numeral Converter Category: Calculators ## How do you convert Roman numerals to numbers? Add the symbol values from left to right, subtracting when a smaller symbol sits before a larger one: MCMXCIV is 1000 + 900 + 90 + 4 = 1994. This free Roman numeral converter works both ways instantly - type a number from 1 to 3999 or a numeral and read the result with its worked breakdown. Each Roman symbol has a **fixed value**, and standard notation combines at most three repeats with six subtractive pairs (IV, IX, XL, XC, CD, CM): SymbolIVXLCDMValue1510501005001000Everything runs **locally in your browser**. Nothing you type is uploaded or stored, the conversion updates on every keystroke, and invalid input gets a specific message (wrong letters, non-standard sequences like IIII, or numbers outside 1-3999) instead of a silent wrong answer. ## How to use it 1. **Type in either field** - Enter a whole number from 1 to 3999 on the left, or a Roman numeral (uppercase or lowercase) on the right. The other side converts as you type. 2. **Read the breakdown** - Below the fields the converter shows the worked expansion - MCMXCIV = M + CM + XC + IV = 1000 + 900 + 90 + 4 - so you can see how the value is built. 3. **Copy the result** - Use the Copy button next to either field to grab the number or the numeral. Clear resets both fields, and Example reloads 1994 = MCMXCIV. ## Who it's for - **Students and teachers** checking Roman numeral homework, with the worked breakdown showing exactly which symbols add or subtract. - **Tattoo and engraving planning** - converting a birthday, wedding year, or anniversary into numerals and verifying it back before it becomes permanent. - **Writers and editors** decoding chapter numbers, book prefaces, movie sequels, and Super Bowl or WrestleMania numbering. - **History and genealogy readers** translating years on monuments, cornerstones, gravestones, and old title pages. - **Designers and developers** generating correct numerals for clock faces, list styles, outlines, and film credit dates. ## Expert note This converter enforces strict subtractive notation: only I, X, and C can subtract, and only from the next two larger symbols - so 4 is IV, 49 is XLIX (not IL), and 999 is CMXCIX (not IM). Additive forms like IIII are flagged rather than guessed at, because sources that accept them silently also accept genuinely ambiguous strings. ## Frequently asked questions ### Is this Roman numeral converter free? Yes - 100% free, no sign-up, and no usage limits. The converter runs entirely in your browser with plain JavaScript, so it keeps working offline once the page has loaded. ### Is anything I type uploaded? No. The conversion happens locally on your device. Nothing you enter is sent to a server, stored, or shared - close the tab and it is gone. ### How do you read a Roman numeral like MCMXCIV? Scan left to right and add, subtracting when a smaller symbol comes first: M = 1000, CM = 900 (100 before 1000), XC = 90 (10 before 100), IV = 4 (1 before 5). Total: 1994. The converter prints this exact breakdown for every valid numeral. ### Why do Roman numerals stop at 3999? Standard notation repeats a symbol at most three times, so the largest writable value is MMMCMXCIX = 3999. The Romans wrote bigger numbers with a vinculum - an overline multiplying a symbol by 1000 - but that needs special typography, so nearly all modern converters cap at 3999. ### Is IIII wrong for 4? In standard subtractive notation, 4 is IV, and this converter flags IIII as non-standard. The additive IIII does have one famous home: traditional clock faces, which use IIII for visual balance with VIII on the other side of the dial. ### Is there a Roman numeral for zero? No. The classical system has no symbol for zero and no negative numbers - it starts at I = 1. Medieval scribes sometimes wrote N (for nulla) in tables, but it was never part of standard notation, which is why converters accept only 1 to 3999. ### How do I write a year or date in Roman numerals? Convert each part separately. The year 2026 is MMXXVI; a date like 14-2-2026 becomes XIV·II·MMXXVI. For tattoos or engravings, convert the numeral back to digits here first - a misplaced subtraction is easy to miss by eye and permanent in ink. ## Related tools - [Percentage Calculator](https://candoya.com/tools/percentage-calculator/) - [Z-Score Calculator](https://candoya.com/tools/z-score-calculator/) - [Perimeter Calculator](https://candoya.com/tools/perimeter-calculator/) - [Correlation Coefficient Calculator](https://candoya.com/tools/correlation-coefficient/) --- *Markdown edition of , published for AI agents and other automated readers. Index of key pages: .*