Date to Roman Numeral Converter
Type a date on the left and each number gets converted to Roman numerals independently, keeping whatever separator you used — slashes, dashes, dots, or nothing at all. Take January 5th, 2024, written as 5/1/2024: it converts to V/I/MMXXIV. Every digit run gets its own conversion, and everything else in the text is left exactly as typed, so it works equally well on a bare date or on a full sentence mentioning one.
Roman numerals only use seven symbols, each with a fixed value:
| Numeral | Number |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
How does the conversion work?
Each number is built by combining the largest symbols possible, largest first. Most of the time that's straightforward addition — 8 is VIII (5+1+1+1) — but for 4 and 9 in each place value, Roman numerals use subtraction instead of four repeated symbols: 4 is IV (one less than 5), 9 is IX (one less than 10), 40 is XL, and 90 is XC. That's why the pattern isn't purely "add symbols until you reach the number."
What happens with a day or month over the usual range, or a year of zero?
The converter doesn't check whether a date is calendar-valid — it just converts whatever digits it finds, so a day like 32 or a month like 13 still converts normally (XXXII, XIII). A value of zero has no Roman numeral at all, since the system has no symbol for it, so a year written as "00" converts to nothing rather than a placeholder character.
Is there a limit to how large a number this handles?
Roman numerals traditionally cap around 3999 (MMMCMXCIX) in everyday use, but this converter keeps going past that by repeating "M" for every additional thousand — so 4000 becomes MMMM and 9999 becomes MMMMMMMMMCMXCIX. It's unusual to need a Roman numeral that large, but the tool won't refuse it.
Related tools
- Number to Words Converter — spell numbers out in words instead of Roman numerals.
- Random Date Generator — generate a random date to convert.
Last reviewed: August 2026