What is the largest Roman numeral this tool supports?

The tool supports values from 1 to 3,999 (MMMCMXCIX). This is the maximum in the standard Roman numeral system without vinculum (overline) notation.

What is subtractive notation in Roman numerals?

Subtractive notation places a smaller symbol before a larger one to indicate subtraction. For example, IV means 5 minus 1 = 4, and CM means 1000 minus 100 = 900. This avoids repeating symbols four times (IIII).

How do you write the current year in Roman numerals?

Enter the current year as a decimal number in the converter and the Roman numeral representation will appear instantly. For example, 2026 converts to MMXXVI.

Roman
Numeral
Converter

Convert between decimal numbers and Roman numerals. Supports values from 1 to 3,999 with step-by-step conversion breakdowns.

Decimal to Roman

Enter a number (1–3,999)

Roman to Decimal

Enter a Roman numeral

Reference Table

Decimal	Roman
1	I
4	IV
5	V
9	IX
10	X
40	XL
50	L
90	XC
100	C
400	CD
500	D
900	CM
1000	M

Learn more

MCMXCIV is 1994 — but how does the subtraction rule actually work, and why does it stop at 3,999?

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RomanNumeralConverter