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Number bases

Roman numeral converter

Type a number or a Roman numeral in the Roman numerals box below the base converter.

2026 = MMXXVI. I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.

Roman numerals table

Numbers and Roman numerals
NumberRoman
1I
2II
3III
4IV
5V
9IX
10X
14XIV
19XIX
40XL
50L
90XC
100C
400CD
500D
900CM
1000M
1999MCMXCIX
2000MM
2025MMXXV
2026MMXXVI
3999MMMCMXCIX

Questions and answers

How do Roman numerals work?

Symbols are added from largest to smallest (VI = 6), except that a smaller symbol before a larger one is subtracted (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900).

What is the largest Roman numeral?

In standard form, 3,999 (MMMCMXCIX). Larger values need a bar over the letters, which is not part of the standard set.