3 = III
3 in Roman numerals is III.
Three written with the letters I I I.
3 in words: Three
Three in Roman numerals is III. It is short enough to write from memory once you know the pattern, and it turns up constantly on watch dials, book chapters and film sequels.
Everything in III is additive here, so you simply add each letter's value together. Numbers like this are a good place to get comfortable before tackling the subtractive forms such as IV and IX.
How 3 breaks down
Reading III from left to right, each group is added together to reach 3:
| Group | Value | Place |
|---|---|---|
| III | 3 | ones |
| III | 3 | total |
Frequently asked questions
What is 3 in Roman numerals?
3 in Roman numerals is III.
How do you write 3 in words?
3 is written "Three" in English.
What number comes before III?
The number before III is 2, written II in Roman numerals.
What number comes after III?
The number after III is 4, written IV in Roman numerals.
Related numbers
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.