Roman Numeral Converter
Convert numbers to Roman numerals and back.
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Copy or share after running the tool. Saved tools and settings stay in this browser.
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Convert Roman numerals both ways
Enter a number to see its Roman numeral, or type a numeral like MMXXIV to read the value as a regular number. Roman numerals run from I to MMMCMXCIX, covering 1 through 3999, and use seven letters whose positions add or subtract. They turn up on clocks, book chapters, film credits and monument dates.
The seven symbols
I is 1, V is 5, X is 10, L is 50, C is 100, D is 500 and M is 1000.
Frequently asked questions
What is the largest Roman numeral here?
Standard Roman numerals reach 3999, written MMMCMXCIX. Larger values historically used bars over letters, which this tool does not use.
How does subtraction work?
A smaller symbol before a larger one is subtracted, so IV is 4 and IX is 9, while VI is 6.