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Roman Numeral Converter

Convert numbers 1–3,999 to Roman numerals and back with a place-by-place breakdown; non-standard forms like IIII get the correct spelling.

Arabic numerals

Whole numbers from 1 to 3,999

Number

Commas are fine.

Roman numerals

I · V · X · L · C · D · M, lowercase accepted

Roman numerals

For non-standard forms like IIII or IC, the correct form is shown.

MMXXVI= 2,026

MM2,000
XX20
VI6

Symbols and subtractive notation

Roman numeral symbols
Symbol	Value	Symbol	Value
M	1,000	CM	900
D	500	CD	400
C	100	XC	90
L	50	XL	40
X	10	IX	9
V	5	IV	4
I	1

A symbol repeats at most three times (III = 3), and only six subtractive pairs put a smaller value before a larger one: IV, IX, XL, XC, CD and CM. Zero, negative numbers and fractions cannot be written in Roman numerals.

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How to use

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Type in either the number or the Roman numeral field
Check the converted value and the breakdown by place in the other field
Copy the notation you need

How it works and good to know

Standard Roman numerals cover only 1 to 3,999 (MMMCMXCIX); there’s no zero, negative or decimal. A letter can repeat at most three times, and only the six subtractive forms IV, IX, XL, XC, CD and CM are standard. Entered Roman numerals are read, rebuilt in standard notation and compared, which filters out forms such as IIII, IC and VX. From 4,000 up, vinculum (overline, ×1000) notation is shown for reference.

Roman Numeral Converter

Arabic numerals

Roman numerals

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