How to Convert Numbers to Roman Numerals
The Roman Numerals Converter translates standard decimal (Arabic) numbers (1 to 3999) into classical Roman numerals, and decodes Roman numeral strings back into standard numbers. It breaks down each place value (thousands, hundreds, tens, units) and explains the additive and subtractive rules used by ancient Romans.
Step-by-Step Instructions:
- Number to Roman: Enter any number from 1 to 3999 (e.g.
2026) into the input box or click a sample preset button (2026, 1984, 500, 3999). - Choose Letter Case: Toggle between UPPERCASE (Classical Latin) and lowercase (Medieval).
- View Place Value Breakdown: See how thousands (
MM), hundreds (C/D/M), tens (X/L/C), and units (I/V/X) combine to form the final numeral. - Roman to Number: Switch to the Roman to Number tab and type any Roman numeral (e.g.
MCMLXXXIV) to see its numerical value and mathematical evaluation steps. - One-Click Copy: Click Copy Roman Numeral to copy the output.
Core Rules of Roman Numerals
➕ 1. The Additive Principle
When symbols are placed in descending order of value, their values are added together:
VI = 5 + 1 = 6 | XVI = 10 + 5 + 1 = 16
➖ 2. The Subtractive Principle
When a smaller symbol appears before a larger symbol, subtract the smaller value from the larger:
IV = 5 - 1 = 4 | IX = 10 - 1 = 9 | XC = 100 - 10 = 90
Roman Numeral Symbols Reference Table
| Symbol | Value | Subtractive Form | Example |
|---|---|---|---|
| I | 1 | IV (4), IX (9) | III = 3 |
| V | 5 | N/A | VIII = 8 |
| X | 10 | XL (40), XC (90) | XXX = 30 |
| L | 50 | N/A | LXX = 70 |
| C | 100 | CD (400), CM (900) | CCC = 300 |
| D | 500 | N/A | DCC = 700 |
| M | 1000 | N/A | MMM = 3000 |
Frequently Asked Questions
What is the highest number you can write with standard Roman numerals?
The highest standard Roman numeral is 3,999 (written as MMMCMXCIX). To represent numbers 4,000 and above, ancient Romans used a horizontal overline bar called a vinculum (e.g. V̅ = 5,000).
Why is there no Roman numeral for Zero (0)?
The Roman numeral system was developed primarily for trade, commerce, and accounting. Because Romans did not have the concept of zero as a positional placeholder number, they used the Latin word nulla to denote "none".
💬 Discussion 0
Write a Comment