Roman Numerals Converter (Number ↔ Roman, Free)

Use this free Roman numerals converter to go both ways: type a number from 1 to 3999 to see it in Roman numerals, or type a Roman numeral to read it as an ordinary number. Each answer comes with a breakdown showing how the thousands, hundreds, tens and ones map to symbols.

How to use the converter

1. Choose a direction: Number → Roman or Roman → Number.
2. Enter your value.
3. Read the converted result and the place-value breakdown.

How Roman numerals work

Roman numerals use the symbols I, V, X, L, C, D and M. Values are added left to right, except for six subtractive pairs — IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900) — where a smaller symbol before a larger one means subtract.

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Frequently asked questions

How do you write 2024 in Roman numerals?

2024 = MMXXIV: MM is 2000, XX is 20, and IV is 4.

Why is the range only 1 to 3999?

Standard Roman numerals have no zero and no symbol above M, so the largest value written with ordinary letters is 3999 (MMMCMXCIX).

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What are subtractive pairs?

Combinations like IV, IX, XL, XC, CD and CM, where a smaller numeral placed before a larger one is subtracted from it.

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