Roman Numeral Converter

Calculation

Convert numbers to Roman numerals and Roman numerals to numbers instantly. Free bidirectional converter up to 3999 with examples.

Conversion is live in both directions. Type a number to get its Roman form, or type a Roman numeral like MCMLIV to read it as a number.

How do Roman numerals work?

Roman numerals use letters to represent values: I is 1, V is 5, X is 10, L is 50, C is 100, D is 500 and M is 1000. Values are usually written largest to smallest and added together.

When is a smaller numeral subtracted?

When a smaller numeral appears before a larger one, it is subtracted. IV means 4 (5 - 1), IX means 9 and CM means 900. This keeps the notation compact instead of writing four equal symbols.

What is the maximum number?

This tool converts numbers from 1 to 3999. Larger values were written with special bars in antiquity, so the classic system shown here normally stops at MMMCMXCIX.

Where are Roman numerals used today?

  • Chapter and volume numbers in books and documents.
  • Years on buildings, clock faces and movie credits.
  • Rulers, popes and kings like Henry VIII or Louis XIV.
  • Outline numbering in essays and official papers.

How do I use the converter?

Type any whole number from 1 to 3999 and the Roman form appears instantly. Type a Roman numeral and the number is translated back. Both fields update live in both directions.

Quick Roman numeral examples

  • 1 = I, 4 = IV, 5 = V, 9 = IX
  • 10 = X, 40 = XL, 50 = L, 90 = XC
  • 100 = C, 400 = CD, 500 = D, 900 = CM
  • 2026 = MMXXVI, 2025 = MMXXV, 1999 = MCMXCIX

Roman numeral conversion FAQs

  • What is 4 in Roman numerals? IV
  • What is 9 in Roman numerals? IX
  • What is 14 in Roman numerals? XIV
  • What is 40 in Roman numerals? XL
  • What is 49 in Roman numerals? XLIX
  • What is 99 in Roman numerals? XCIX
  • What is 2026 in Roman numerals? MMXXVI
  • Is 0 a Roman numeral? No, the classic Roman system has no symbol for zero.

Frequently Asked Questions

  • What is Roman Numeral Converter?

    Convert numbers to Roman numerals and Roman numerals back, up to 3999.

  • How do I use Roman Numeral Converter?

    Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.

  • Is Roman Numeral Converter free?

    Yes, Roman Numeral Converter is completely free. No signup, no downloads and no usage limits.

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