Roman Numeral Converter

Type a number (1–3999) to get its Roman numeral, or type a Roman numeral to get the number.

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The number 2026 converted into the Roman numeral MMXXVI and back

How Roman numerals work

Roman numerals use seven letters: I (1), V (5), X (10), L (50), C (100), D (500) and M (1,000). Values are added from largest to smallest, except that a smaller symbol placed before a larger one is subtracted: IV is 4, IX is 9, XL is 40, XC is 90, CD is 400 and CM is 900.

  • 2026 = MM + XX + VI = MMXXVI
  • 1994 = M + CM + XC + IV = MCMXCIV
  • 3999 = MMMCMXCIX, the largest standard numeral

Limits and rules

Standard numerals cover 1 to 3,999 because there is no symbol above M and no more than three of the same letter are repeated in a row. There is no zero. When reading, the tool rejects forms like IIII or VX and tells you the standard spelling.

Frequently asked questions

What is 2026 in Roman numerals?

MMXXVI.

Why is there no zero in Roman numerals?

The system was designed for counting and recording quantities, and it had no symbol for zero.

What is the largest Roman numeral?

3,999 (MMMCMXCIX) in the standard system. Larger values historically used a bar over a numeral to multiply by 1,000.

Is IIII a valid Roman numeral?

Clocks often show IIII, but the standard form is IV, which this converter uses.

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