🏛️ Roman Numeral Date Converter

What is the Roman Numeral Date Converter?

Roman numerals are a number system from ancient Rome that builds values from seven letters: I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). Larger numbers are written by placing symbols side by side and adding them, so XV is 15 and CXX is 120. To avoid four of the same letter in a row, the system uses subtractive notation, where a smaller symbol placed before a larger one is subtracted: IV is 4 (one less than five), IX is 9, XL is 40 and CM is 900. A date is just three numbers, the day, the month and the year, so converting it means converting each part on its own and joining them with a separator.

There is no single official Roman numeral date format, which is why this tool offers several. The most common for tattoos is day, then month, then year separated by dots, for example 7.XI.MMXXIV for 7 November 2024. Americans often prefer month first (XI.VII.MMXXIV), and some engravers use dashes, slashes or a raised middle dot for a more classical look. The order matters: 7.XI and XI.VII are the same three numbers in a different sequence, so always confirm which part is which before committing to permanent ink or metal.

The year is usually the part that surprises people. A modern year like 2026 becomes MMXXVI: two thousands (MM), two tens (XX), a five (V) and a one (I). Years from the 1900s often look long because of the subtractive 900: 1999 is MCMXCIX. Classic Roman numerals have no symbol for zero and, in their everyday written form, run from 1 to 3999, which covers every realistic date, so this tool keeps to that range and writes each number using the standard subtractive rules.

When to use it

• Designing a tattoo of a birthday, wedding date or memorial date in Roman numerals.
• Engraving an anniversary or important date on a ring, watch or piece of jewellery.
• Adding a tasteful date to invitations, certificates, plaques or the credits of a film or book.
• Double-checking a Roman numeral date you have seen so you can read or verify it correctly.

How to use the Roman Numeral Date Converter

1. Pick the date you want to convert using the date picker.
2. Choose the part order: day-month-year, month-day-year, or year-month-day.
3. Read the day, month and year shown individually in Roman numerals.
4. Copy the full format you want (dots, slashes, dashes or spaces) with its copy button.

Formula & method

Worked examples

The seven Roman numeral symbols and their values

Common date parts in Roman numerals

Common mistakes to avoid

• Mixing up the part order. Day-month-year and month-day-year use the same three numbers in a different sequence, so 7.XI and XI.VII can both look right. Decide which order you mean before engraving or tattooing, because the parts are not always obvious to a reader.
• Writing four identical letters in a row. Roman numerals avoid IIII or XXXX. The number 4 is IV, 9 is IX, 40 is XL and 90 is XC. The one common exception is on some clock faces, which use IIII for four, but that is a decorative tradition, not the standard rule.
• Expecting a symbol for zero. There is no Roman numeral for zero, so a date like 2 March is II, not 02. Drop any leading zeros when you write the day or month in Roman numerals.
• Treating the result as a single number. A Roman numeral date is three separate numbers joined by separators, not one giant numeral. Run the day, month and year through the converter individually rather than the date as a whole.

Glossary

Roman numeral

A number written with the letters I, V, X, L, C, D and M, the system used in ancient Rome.

Subtractive notation

Writing a smaller symbol before a larger one to subtract it, as in IV for 4 and CM for 900, to avoid four repeats.

Additive notation

Adding symbols placed from largest to smallest, as in XVII for 17, which is the default way numerals combine.

Separator

The character placed between the day, month and year, such as a dot, slash, dash, space or raised middle dot.

Frequently asked questions