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أدوات التحويل

محوّل الأرقام الرومانية

Convert between Roman numerals and decimal numbers.

كيفية استخدام محوّل الأرقام الرومانية

1

Choose your conversion direction

Select either Number to Roman or Roman to Number mode.

2

Enter your value

Type a decimal number or a Roman numeral string in the input field.

3

Copy the result

Click Copy to save the converted value to your clipboard.

What is the Roman Numeral Converter?

Roman numerals are a number system from ancient Rome that uses 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. This converter turns a regular number into Roman numerals and translates Roman numerals back into a regular number.

Enter a value in either field and the conversion is instant. It handles the subtractive notation correctly, so 4 becomes IV rather than IIII and 9 becomes IX, following the standard rules used today.

  • Convert numbers to Roman numerals and back
  • Correct subtractive notation (IV, IX, XL, XC, CD, CM)
  • Supports values from 1 to 3999
  • Validates input and flags malformed numerals
  • Copy the result with one click
  • Instant conversion in your browser

How Roman numerals work

You build a number by adding symbols from largest to smallest, so XVI is 10 + 5 + 1 = 16. When a smaller symbol comes before a larger one, you subtract it, which is why IV is 5 minus 1 = 4 and CM is 1000 minus 100 = 900. A symbol is never repeated more than three times in a row, which is exactly why subtractive notation exists.

The standard rules this tool follows

Only I, X, and C are used as subtractors, and only before the next one or two larger symbols. So 4 is IV, 9 is IX, 40 is XL, 90 is XC, 400 is CD, and 900 is CM. Values like IIII or VX are not valid standard numerals, and the converter produces the correct form instead.

Why the range stops at 3999

Standard Roman numerals only go up to 3999 (MMMCMXCIX) because there is no single symbol for 5000 or 10000. Larger numbers historically used a bar over a numeral to multiply it by 1000, but that notation is rarely needed, so this tool covers the everyday range of 1 to 3999.

الأسئلة الشائعة

How do you write 4 in Roman numerals?
Four is IV, which is 5 minus 1. It is not IIII, because a symbol is not repeated four times in standard Roman numerals.
What is the largest number I can convert?
Standard Roman numerals go up to 3999, written MMMCMXCIX. There is no standard single symbol for larger values, so the converter covers 1 to 3999.
What does subtractive notation mean?
When a smaller symbol appears before a larger one, you subtract it. IX is 9 (10 minus 1) and XC is 90 (100 minus 10). This keeps numerals short.
Can it convert Roman numerals back to numbers?
Yes. Type a numeral like MCMLXXXIV and it returns 1984. It also flags input that is not a valid standard numeral.
Why is there no symbol for zero?
The Roman system had no symbol for zero because it was designed for counting and tallying, not for positional arithmetic. Zero was added to number systems much later.

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