Roman Numeral Converter
Enter a number (1–3999) to convert to Roman numerals, or enter Roman numerals to convert back to decimal.
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Frequently Asked Questions
What is the largest Roman numeral?
The standard Roman numeral system goes up to 3,999 (MMMCMXCIX). Numbers above 3,999 use a bar over the numeral to multiply by 1,000.
Why are there no zeros in Roman numerals?
Roman numerals were developed before the concept of zero. The modern number zero came from Indian mathematicians and reached Europe in the Middle Ages.