Convert Roman Numerals & Decimals

Professional Roman Numerals converter with instant processing. Convert between decimal and roman numerals instantly.

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Roman Numeral

Decimal Number

Roman numerals to decimal conversion result

I = 1

Decimal	Roman	Decimal	Roman	Decimal	Roman	Decimal	Roman
1	I	20	XX	100	C	1000	M
2	II	30	XXX	200	CC	2000	MM
3	III	40	XL	300	CCC	3000	MMM
4	IV	50	L	400	CD	3500	MMMD
5	V	60	LX	500	D	3900	MMMCM
6	VI	70	LXX	600	DC	3999	MMMCMXCIX
7	VII	80	LXXX	700	DCC	1994	MCMXCIV
8	VIII	90	XC	800	DCCC	2024	MMXXIV
9	IX	99	XCIX	900	CM	2025	MMXXV
10	X	19	XIX	49	XLIX	444	CDXLIV

Roman Numerals Rules

I = 1, V = 5, X = 10
L = 50, C = 100, D = 500
M = 1000
Subtractive: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900)

✓ Range: 1 to 3,999
✓ No zero in Roman numerals
✓ Repeat max 3 times (III, XXX, CCC)
✓ Case insensitive (i, I, v, V)

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Frequently Asked Questions

Roman numerals are a numeral system originating in ancient Rome that uses combinations of letters (I, V, X, L, C, D, M) to represent numbers. They are still used today in clocks, book chapters, movie sequels, and formal documents.

To convert decimal to Roman numerals, repeatedly subtract the largest possible Roman numeral value and append the corresponding symbol. For example, 14 = X (10) + IV (4) = XIV.

The Roman numeral for 2024 is MMXXIV. Breakdown: MM = 2000, XX = 20, IV = 4.

The standard Roman numeral system can represent numbers up to 3999, written as MMMCMXCIX. Numbers beyond 3999 require special notation such as bars over letters (vinculum) to multiply values by 1000.

I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000. These seven symbols are combined to form all Roman numeral values.

Roman numerals are used today for aesthetic and traditional reasons: clock faces, movie release years (e.g., © MMXXIV), Super Bowl numbering, book chapter headings, regnal names (e.g., King Charles III), and formal outlines.

Subtractive notation means a smaller value placed before a larger value is subtracted. The valid subtractive pairs are: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900. Only one smaller numeral may precede a larger one.