Roman Numerals Converter

Instructions: Enter a number (1-3999) to convert to Roman numerals, or enter Roman numerals to convert to a number.

Roman Numeral Reference

I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000

Subtractive notation: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900

How to Use This Tool

This tool converts a number to Roman numerals and vice versa.

Step-by-Step Instructions

  1. Enter a number between 1 and 3999 in the "Number" field. For example, type 2024.
  2. Click the "Number → Roman" button. The tool will show the Roman numeral version of your number.
  3. To convert a Roman numeral to a number, type the numeral in the "Roman Numeral" field. For example, type MMXXIV.
  4. Click the "Roman → Number" button. The tool will display the number equivalent.
  5. If you want to start over, click the "Clear" button. This clears all the fields.

Input Fields Explained

The "Number" field accepts integers from 1 to 3999. Only valid entries will convert properly.

The "Roman Numeral" field accepts the letters M, D, C, L, X, V, and I in uppercase. The tool converts these to a number value.

Output and Error Messages

The result appears below the buttons. A green message shows when a conversion works. A red message warns you if a mistake is made.

Limitations and Special Notes

Common Use Cases

This converter helps with academic work or casual puzzles. It aids in understanding historical documents.

It works well when you need to cross-check numeral values in various texts.

Final Thoughts

This converter is simple and effective. Follow the instructions and get quick results.