Roman Numerals Converter

Convert between regular numbers and Roman numerals (I, V, X, L, C, D, M).

Type 2026 or MMXXVI.
Numbers 1 to 3,999.
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Result
Breakdown
Converted
Work

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How Roman Numerals Work

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

Write the largest values first and add. Six subtractive pairs replace four-in-a-row: IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900). No symbol repeats more than three times, which is why standard numerals stop at 3,999 (MMMCMXCIX).

Worked Example

Tips

Clock faces often use IIII for 4, and larger numbers were written with a bar over a numeral to multiply by 1,000; this page sticks to the standard form and tells you if an input isn’t standard.