3 in Roman Numerals

How to write 3 in Roman numerals, step by step

Roman numerals are built from largest value to smallest. Split 3 into place values first: 3.

Now swap each part for its symbols: 3 becomes III. Written together that is III.

No subtraction is needed here, so the symbols are simply added in descending order.

• 3 = III (I is 1, written 3 times)

Is III written correctly?

Yes. III is the standard modern form of 3. A valid Roman numeral never repeats a symbol more than three times in a row, never repeats V, L or D at all, and only ever subtracts I, X or C, and only from the next two larger symbols.

Those rules are what keeps a number to a single accepted spelling, so a reader never has to guess.

How to type III on a keyboard

Roman numerals are ordinary capital letters, so you can type III directly: I, I, I. Nothing special is required and it will work in any font, any document and any web form.

Unicode also contains dedicated Roman numeral characters such as Ⅰ, Ⅴ, Ⅹ, Ⅼ, Ⅽ, Ⅾ and Ⅿ. They exist for typesetting East Asian text and they look almost identical, but search engines, spell checkers and screen readers handle the plain letters better, so the letters are usually the right choice.

Where you will see III

Numbers of this size turn up as chapter and page numbers in front matter, as list levels in outlines, as monarch and pope regnal numbers, and in the names of recurring events such as Super Bowl finals.

If you are using III in a document, keep it in capitals. Lowercase roman numerals (iii) are conventionally reserved for preliminary page numbering and sub-lists.