Roman Numeral Converter
Convert Arabic decimals to Roman numerals and vice-versa (up to 3,999)
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Roman Numeral Key
M1000
D500
C100
L50
X10
V5
I1
Converter Mode
Ancient Standard
Standard Roman numerals can represent numbers up to 3,999 (MMMCMXCIX). Larger numbers required special notation like overlines which are not standard in text.
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Historical conversions are calculated locally. No data is sent to our servers.
FAQs
What is the largest Roman numeral possible?
In the standard system used here, the largest number is 3,999 (MMMCMXCIX). Beyond this, ancient Romans used horizontal bars over symbols to multiply them by 1,000.
Is there a Roman numeral for zero?
Ancient Romans did not have a symbol for zero. When they needed to express 'none', they used the word 'nulla'.