Utilities
Dates and numbers, in Roman numerals
Turn a date or number into Roman numerals (or decode numerals back) with tattoo-ready date formatting.
For the best results: Type a date like 21/08/2026 for the day·month·year numeral format used in tattoos and engravings, or any number up to 3999, or paste numerals to decode them.
Runs entirely in your browser, what you paste is never uploaded, logged, or stored.
What is Roman Numeral Converter?
Roman Numeral Converter is a free online utility that converts dates and numbers into Roman numerals, or decodes numerals back into numbers. The math runs right in the page, so the numbers you enter stay on your device and are never sent anywhere. There is no account step, no limit on how many times you calculate, and it keeps working offline.
- ✦Runs entirely in your browser. Nothing you enter is ever uploaded
- ✦No account, no sign-up, and no data leaves your device
- ✦Works offline once the page has loaded
See it in action
A film-credits year and a tattoo date both need converting, in opposite directions.
What you type
MCMXCIV one way, 2026 the other
What you get
MCMXCIV reads as 1994, and 2026 becomes MMXXVI. The classical range 1 to 3999 is enforced with a clear note beyond it.
Tip: Non-standard forms like IIII are read leniently as 4, matching how clock faces actually use them. Dates can go in whole, like 21/08/2026, and each part converts.
Use cases
What people use it for
Convert a wedding or birth date into Roman numerals for a tattoo or engraving design.
Decode the MCMXCIV at the end of an old film's credits into a plain year.
Number chapters, clock faces, event editions and building cornerstones consistently.
Who uses Roman Numeral Converter?
Tattoo clients
verify a meaningful date converts correctly, in both directions, before it becomes permanent ink
Maths students
check homework answers and see why the notation rules produce them, forwards and backwards
Graphic designers
set clock faces, certificates, film credits and edition numbering without second-guessing the notation
How it works
- 1Vary step 1 by tool shape using the existing FORM_TOOL_IDS set in app/(public)/[category]/[tool]/page.tsx. Form tools get "Set the options for what you need." and text tools get "Paste your text into the box." Where a tool's config makes it easy, name its own inputs instead. Steps 2 and 3 stay shared as they are.
- 2Your browser computes the result instantly. Nothing is uploaded anywhere.
- 3Copy the output; the tool keeps working even offline.
Tips for the best results
- Verify tattoo conversions in both directions, convert the date, then decode the result back.
- Remember only I, X and C subtract; IL and IIX are never valid forms.
- Use separators between day, month and year or the date becomes one unreadable number.
- Confirm day-month order before converting; 3.7 and 7.3 produce different numerals with no warning.
- Years from 1990 to 1999 are the fiddliest, 1994 is MCMXCIV, carrying three subtractive pairs.
FAQ
Frequently asked questions
How does subtractive notation actually work?
A smaller symbol placed before a larger one subtracts from it, IV is four, IX is nine, XL is forty, CM is nine hundred. Only I, X and C may be used subtractively, and each only before the next two larger symbols, which is why 49 is XLIX rather than the tempting shortcut IL. The converter applies these rules strictly when writing numerals, and reads non-standard forms such as IIII leniently when decoding.
Why is there no Roman numeral for zero?
The Romans simply never needed one, their system records quantities, not positions, so nothing was written as a word, nulla, rather than a symbol. Zero as a digit only matters in positional systems like ours, where it holds a place. It is a good reminder that Roman numerals are tallies dressed up in letters, not a base-ten notation.
What is the largest number standard numerals can express?
Three thousand nine hundred and ninety-nine (MMMCMXCIX) because convention allows at most three repetitions of a symbol and M is the largest one. The Romans handled bigger values with a vinculum, an overline multiplying a numeral by a thousand, but that notation rarely survives in plain text, so 3999 is the practical ceiling for modern use.
How are dates usually written in Roman numerals?
Day, month and year converted separately and divided by dots, slashes or small spaces, 14.2.2020 becomes XIV·II·MMXX. That separated style dominates tattoos and engravings because a date run together as one number would be unreadable. Always decide the day-month order first; a month-first American date reads differently and the numerals will not warn you.
Is a date I convert saved anywhere?
Nothing you enter goes anywhere. The conversion is a lookup-and-assemble routine that runs in your browser, so birthdates, anniversaries and other personal dates are never sent, stored or logged. Given how often these conversions are for tattoos of genuinely private dates, that separation is worth having, and the page keeps converting with no connection.
Why do clock faces use IIII instead of IV?
Tradition, mostly. Watchmakers have used IIII for centuries, explanations range from visual balance against the VIII sitting opposite it, to avoiding the sacred abbreviation of Jupiter's name in Latin. Neither story is settled history. Either form is understood, but IIII on a clock face is deliberate style, not an error.
What do the letters in Roman numerals stand for?
Seven symbols carry all the values: I is one, V five, X ten, L fifty, C one hundred, D five hundred and M one thousand. C traces to centum and M to mille, the Latin words for hundred and thousand, the others likely evolved from tally marks rather than words.
What year is MMXXVI?
2026. Break it apart symbol by symbol: MM is two thousand, XX is twenty, VI is six. Reading numerals is just addition once you have checked for subtractive pairs like IV or CM, MMXXVI contains none, so the values simply sum from left to right.
Are there any usage limits?
None. Everything is generated locally in your browser, so there is no server cost, no metering, and no daily cap, use it as many times as you like, completely free.
Also useful
Related free tools
More Utilities tools
