Turn any calendar date into Roman numerals — in the modern numeral style used on cornerstones and tattoos, and in the authentic Kalends, Nones and Ides notation the Romans themselves used.
Conversion runs locally — no dates are sent anywhere.
The clean numeral form people use for tattoos, wedding invitations and building cornerstones.
Real Kalends, Nones and Ides notation with the correct case endings for each month.
Every format has its own copy button, ready to paste wherever you need it.
Pick a date and read off whichever style suits what you are making.
Roman numerals combine seven letters — I, V, X, L, C, D and M — using addition and a limited form of subtraction. Writing a modern date in them is straightforward, but it is worth knowing that no Roman ever wrote a date that way. Their own system counted backwards from three named days in each month, a habit that survives in the English word ides and in the phrase "beware the Ides of March".
Symbols are added left to right, except when a smaller value precedes a larger one, in which case it is subtracted: IV is 4, IX is 9, XL is 40, CM is 900.
Kalends is the 1st of the month, Nones is the 5th or 7th, and Ides is the 13th or 15th. Every other date is expressed as a countdown to whichever comes next.
Romans counted both endpoints, so the day before the Kalends is the second day before, written pridie Kalendas rather than ante diem II.
Standard numerals stop at MMMCMXCIX. Larger values need an overbar to multiply by a thousand, which is why this tool covers years 1 to 3999.
Questions about numerals, Latin dates and how Romans really counted.
Convert the day, month and year separately and join them with a separator. 5 September 2026 becomes V · IX · MMXXVI. There is no ancient standard for this, so the separator is purely a style choice.
They counted backwards from three fixed points in each month: the Kalends on the 1st, the Nones on the 5th or 7th, and the Ides on the 13th or 15th. A date was expressed as so many days before the next of those points, which is why 24 February is ante diem VI Kalendas Martias.
In March, May, July and October the Nones fall on the 7th and the Ides on the 15th. In every other month they land on the 5th and the 13th. The four exceptions are the months that originally had 31 days in the old Roman calendar.
Ab urbe condita means "from the founding of the city". Roman writers sometimes counted years from the traditional founding of Rome in 753 BC, so 2026 AD corresponds to 2779 AUC.
No. Roman numerals have no symbol for zero and no way to write it, which is one reason the system was eventually replaced for arithmetic by Hindu-Arabic numerals.