Roman Numeral Converter
Convert between Roman numerals and Arabic numbers instantly. Supports values from 1 to 3,999.
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Roman Numeral
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Arabic Number
Roman Numeral Reference Chart
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Common Examples
Frequently Asked Questions
How do Roman numerals work?▾
Roman numerals use seven symbols (I, V, X, L, C, D, M) combined additively and subtractively. For example, IV means 5 minus 1 (4), while VI means 5 plus 1 (6).
What is the largest number you can write in Roman numerals?▾
In standard Roman numeral notation, the largest number is 3,999 (MMMCMXCIX). Numbers above 3,999 require extended notation with overlines.
Why is 4 written as IV instead of IIII?▾
Roman numerals use subtractive notation where a smaller value before a larger one means subtraction. IV (5 minus 1) is the standard form for 4, keeping numerals concise.
Is this Roman numeral converter free to use?▾
Yes. This tool is completely free, runs entirely in your browser, and requires no signup. No data is sent to any server.