3 in Roman numerals

III

3 = III

Working: I = 1, I = 1, I = 1

The number 3 is written as III in Roman numerals.

Roman numerals are built by adding symbol values together from largest to smallest: I = 1, I = 1, I = 1. Where a smaller symbol appears before a larger one — as in IV for 4 or IX for 9 — it is subtracted rather than added, which keeps the notation short.

Structurally, III is 3 symbols long. It is entirely additive: every symbol adds to the running total, with no smaller symbol standing before a larger one. One symbol repeats three times, which is the maximum the system allows before a subtractive form becomes necessary.

III is the longest run of identical symbols the system normally permits. A fourth would give IIII, which is why 4 is written IV instead — the subtractive form exists specifically to cap repetition at three.

Nearby numbers

Number	Roman numeral
1	I
2	II
4	IV
5	V
6	VI
7	VII
8	VIII
9	IX

Try another value

Decimal number (1–3999)

Roman numeral

MMXXIV

Reference

X10

L50

C100

D500

M1000

Frequently asked questions

How do you write 3 in Roman numerals?

3 is written III. It breaks down as I = 1, I = 1, I = 1.

What are the seven Roman numeral symbols?

I is 1, V is 5, X is 10, L is 50, C is 100, D is 500, and M is 1,000. All Roman numerals are combinations of these seven symbols, and there is no symbol for zero.

For any other value, use the full Roman Numeral Converter on BrainVert.