Roman Numerals Converter.
Convert numbers to Roman numerals and vice versa with ease. Understand the rules and history behind Roman numerals.
- Utilities
- Runs in your browser
Roman Numerals Converter
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
| Combination | Value |
|---|---|
| IV | 4 |
| IX | 9 |
| XL | 40 |
| XC | 90 |
| CD | 400 |
| CM | 900 |
• Symbols are written left to right, largest to smallest
• A symbol can be repeated up to three times (III = 3, XXX = 30)
• Only one subtraction can be made per numeral (IV = 4, not IIII)
• Only powers of ten (I, X, C) can be used for subtraction
Common Numbers
Famous Years
Special Numbers
How it works
Five steps.
- 01
Enter a number (1-3999) or a valid Roman numeral.
- 02
Choose conversion mode: Number to Roman or Roman to Number.
- 03
View the result instantly with a step-by-step breakdown.
- 04
Learn Roman numeral rules and formatting guidelines.
- 05
Check common conversions and famous historical years.
Features
Easily Convert Roman Numerals and Numbers.
Accurate Conversions
Convert numbers to Roman numerals and vice versa with 100% accuracy, following proper numeral rules.
Two-Way Conversion
Easily switch between converting numbers to Roman numerals and Roman numerals to numbers.
Copy Results Instantly
Quickly copy the converted Roman numeral or number to your clipboard with one click.
Roman Numeral Rules
Understand the logic behind Roman numerals with built-in guidelines and formatting rules.
Historical References
Explore famous historical years in Roman numerals, such as 1776 (MDCCLXXVI) and 2000 (MM).
What are Roman numerals?
Roman numerals are a numeral system used in ancient Rome, based on combinations of letters from the Latin alphabet: I, V, X, L, C, D, and M.
How do Roman numerals work?
Roman numerals use a combination of letters to represent values. The order and placement of these letters determine the final number.
What is the largest number that can be written in Roman numerals?
The largest standard Roman numeral is 3999, written as MMMCMXCIX . Larger numbers require non-standard notation.
Are Roman numerals still used today?
Yes! Roman numerals are used in book chapters, movie release years, clock faces, and even event names like the Olympic Games.
Can I convert decimal numbers to Roman numerals?
No, Roman numerals do not support decimal or fractional values. They only represent whole numbers.
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