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Roman Numeral Converter

Convert between Roman numerals and Arabic numbers. Learn Roman numeral rules and see step-by-step conversions. Supports numbers from 1 to 3,999.

Convert between Roman numerals and Arabic numbers. Learn how Roman numerals work with step-by-step explanations. Supports numbers from 1 to 3,999. All processing happens in your browser β€” completely private.

Roman Numeral Rules

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

β€’ Smaller before larger = subtract (IV = 4, IX = 9)
β€’ Smaller after larger = add (VI = 6, XI = 11)

How to Use

  1. Choose conversion direction (Number to Roman or vice versa)
  2. Enter your value
  3. See the converted result instantly
  4. Click examples for quick conversion

Frequently Asked Questions

❓ Is this tool free?

Yes! All our tools are completely free. No registration, no hidden charges, no ads. Just open and use.

πŸ”’ Is my data safe?

Absolutely. All calculations happen in your browser. We don't store, send, or track any of your data. Everything is processed locally on your device.

πŸ“± Can I use this on mobile?

Yes! All our tools are fully responsive and work perfectly on smartphones, tablets, and desktops.

🌐 Do I need internet?

No! Once the page loads, you can use the tool completely offline. All calculations happen in your browser without any server connection.