Convert numbers and Roman numerals
Enter a whole number from 1 to 3999, or a Roman numeral. The converter picks the direction. IIII and VX are rejected. Nothing is uploaded.
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Quick reference
| Numeral | 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 |
Common years
| Year | Numeral |
|---|---|
| 1066 | MLXVI |
| 1492 | MCDXCII |
| 1776 | MDCCLXXVI |
| 1969 | MCMLXIX |
| 1994 | MCMXCIV |
| 2000 | MM |
| 2026 | MMXXVI |
How to convert a Roman numeral
Use the box for a number or a numeral. The breakdown shows the parts. MCMXCIV = M + CM + XC + IV. That is 1000 + 900 + 90 + 4, which is 1994.
IIII and VX are rejected because they are not standard numerals. 4 is IV. Copy puts the result on the clipboard.
Frequently asked questions
How do I convert a number to a Roman numeral?
Paste a number from 1 to 3999, or paste a numeral such as MCMXCIV. The converter chooses the direction. 1994 becomes MCMXCIV, and MCMXCIV becomes 1994.
Why is IIII not a valid Roman numeral?
IIII is not standard Roman notation. 4 is written IV, and 9 is written IX. VX is not valid either. This converter accepts only the standard forms.
What is the largest number it can convert?
The largest standard Roman numeral on this page is 3999, written MMMCMXCIX. Zero and numbers above 3999 are not used in this system.
Is my number uploaded?
No. The Roman numeral converter runs entirely in your browser.