Roman Numeral Converter

Decimal to Roman

Enter a decimal number (1-3999):

Roman Numeral:

Roman to Decimal

Enter a Roman numeral:

Decimal Number:

Roman Numerals Guide

Roman Numeral	Decimal Value
I	1
IV	4
V	5
IX	9
X	10
XL	40
L	50
XC	90
C	100
CD	400
D	500
CM	900
M	1000

Conversion Rules:

Roman numerals are written from largest to smallest
I, X, C can be repeated up to 3 times in succession
V, L, D can only appear once and cannot be repeated
Subtractive notation is used for numbers like 4 (IV) and 9 (IX)
Maximum supported value is 3,999 (MMMCMXCIX)

Roman Numeral Converter - Convert Numbers to Roman & Roman to Numbers Instantly

The Roman Numeral Converter by SiD X Tool is a fast and accurate tool that allows you to convert numbers into Roman numerals and vice versa. Whether you're a student, teacher, historian, or just curious, this tool makes Roman numeral conversions effortless and educational.

📋 Supported Conversions

🔢 Number to Roman: Convert any number from 1 to 3999 into Roman numerals

🅁 Roman to Number: Convert any valid Roman numeral into a number

🧠 Why Use This Roman Numeral Converter?

⚡ Instant two-way conversion

🔁 Easy switch between Number → Roman or Roman → Number

📱 Mobile-friendly and responsive layout

🧾 Validates Roman numeral formatting automatically

🆓 100% free, with no login or signup

💡 Roman Numeral Basics

Here are the main symbols used in Roman numerals:

I = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000

Example: 2024 = MMXXIV

📘 Use Cases

🎓 Students – For learning Roman numeral rules in school

🧑‍🏫 Teachers – To prepare class examples & questions

📅 Date formatting – For numbering years, clocks, and chapters

📜 Historians & Researchers – For ancient scripts or monuments

🛠️ Designers – To use stylish numbering in outlines, logos, or events

⚠️ Input Limitations

Numbers supported: 1 to 3999 (standard Roman numeral range)

Roman numerals must be uppercase and follow correct order (e.g., IV not VI)

FAQs – Frequently Asked Questions

Q: What is the Roman numeral for 1999?
A: MCMXCIX

Q: Can I convert Roman numerals to numbers?
A: Yes, enter any valid Roman numeral and get the equivalent number instantly.

Q: Does this tool support lowercase input?
A: Yes, lowercase input will be auto-converted to uppercase.

Q: Can I use this tool offline?
A: Once loaded, it can work offline for basic conversions.

Conclusion

The Roman Numeral Converter from SiD X Tool is your go-to resource for converting Roman numerals and learning how they work. Whether for school, design, history, or fun — it’s fast, accurate, and completely free. Try it now and explore the world of Roman numbers!