Roman Numerals Converter

Simple, Fast, and Accurate

Use this roman numerals converter to switch between numbers and Roman numerals. It supports values from 1 to 3999. You can convert in both directions with a click. Clear messages guide each step.

How It Works

Enter a whole number and convert it to a Roman numeral. Or enter a Roman numeral and convert it to a number. The result line shows both forms in a clear format. Success appears with a green note. Input issues show a red note and a short tip.

The converter follows standard Roman symbols and values. Here are the basics you may need:

• I equals 1, V equals 5, X equals 10
• L equals 50, C equals 100, D equals 500
• M equals 1000
• Subtractive pairs save space. IV equals 4 and IX equals 9
• XL equals 40 and XC equals 90
• CD equals 400 and CM equals 900

Why You’ll Love It

This roman numerals converter runs fast and gives clear feedback. It works for school, research, and everyday tasks. You can press Enter in a field to run the matching conversion. A Clear button resets both fields and the result line.

Results stop at 3999 by design. Roman numerals have no symbol for zero or negative values. The tool uses the seven symbols only. Case does not matter because the tool reads lower and upper case.

How to Use This Tool

Inputs explained

• Number field. Enter any whole number from 1 to 3999
• Roman Numeral field. Enter the letters M D C L X V I only
• Buttons. Number → Roman, Roman → Number, and Clear
• Result line. Shows both forms after each conversion

Converting from Number to Roman

1. Click the Number field and type a value from 1 to 3999
2. Select the button labeled Number → Roman
3. Read the result line for the number and its Roman form
4. Find the Roman value also filled in the Roman field
5. Press Enter in the Number field to convert as well

Examples

• 4 becomes IV
• 9 becomes IX
• 40 becomes XL
• 90 becomes XC
• 2024 becomes MMXXIV

Converting from Roman to Number

1. Click the Roman Numeral field and type your Roman letters
2. Use only M, D, C, L, X, V, and I characters
3. Select the button labeled Roman → Number
4. Read the result line for the Roman input and its number
5. Press Enter in the Roman field to convert as well

Examples

• IV becomes 4
• IX becomes 9
• XL becomes 40
• XC becomes 90
• MMXXIV becomes 2024

Real-World Benefits

Here are common ways people use this roman numerals converter:

• Add Roman page numbers to reports or appendices
• Read clock faces and confirm values at a glance
• Check dates in historical texts and inscriptions
• Format event names like Super Bowl and film sequels
• Create clean outlines with Roman sections and subheads
• Build or test a script that handles Roman logic

Clear guidance saves time and reduces errors. The tool gives instant feedback and quick results. You get a clean answer without extra steps.

Final Thoughts

This roman numerals converter keeps conversion simple and reliable. Use whole numbers from 1 to 3999 for best results. Type only M D C L X V I in Roman mode. The result line shows exactly what you need. For quick checks or study, it does the job well.