Built and fact-checked by the DocNectar team — see our editorial standards
Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
Fully responsive design. Works on all devices & screen sizes.
Privacy Focused
Your data stays on your device. We don't store any inputs.
100% Free
No hidden costs. This tool is completely free forever.
Roman numerals use combinations of seven letters to represent numbers — a system still used today for clock faces, movie copyright years, and formal document numbering.
This converter works in both directions: numbers to Roman numerals, and Roman numerals back to numbers.
How it works
Choose a direction and enter a value. Converting to Roman numerals repeatedly subtracts the largest matching numeral value until nothing remains. Converting from Roman numerals reads left to right, adding each numeral's value unless it's smaller than the one that follows it, in which case it's subtracted instead.
- Enter direction.
- Enter value to convert.
- Click Calculate to see your results.
Examples
Number to Roman numeral
1994 converts to MCMXCIV.
Roman numeral to number
MCMXCIV converts back to 1994.
Who should use it
- Reading a copyright year or clock face written in Roman numerals.
- Formatting a formal document or outline section using Roman numerals.
Industry applications
- Publishing and document formatting
- Education and history
Advantages
- Converts in both directions from one tool.
- Shows the numeral-by-numeral breakdown for both conversion directions.
Limitations
- Limited to the standard 1-3,999 range — doesn't support numeral extensions for larger numbers (like a vinculum for thousands multiples).
Common mistakes to avoid
- Writing four repeated numerals in a row (like IIII instead of IV) — standard Roman numerals never repeat a numeral more than three times.
- Mixing up which numeral is subtractive — only I, X, and C are ever used as subtractive prefixes, and only before specific larger numerals.
Best practices
- When converting from Roman numerals, work through the numeral left to right rather than trying to recognize the whole pattern at once — the add-unless-smaller-than-next rule handles every valid case.
Tips
- Roman numerals are still commonly used for outline sub-levels, book chapter numbering, and the "Super Bowl LVIII" style sequential event naming.