30 = XXX
30 in Roman numerals is XXX.
Thirty written with the letters X X X.
30 in words: Thirty
Thirty in Roman numerals is XXX. 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 XXX 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 30 breaks down
Reading XXX from left to right, each group is added together to reach 30:
| Group | Value | Place |
|---|---|---|
| XXX | 30 | tens |
| XXX | 30 | total |
Frequently asked questions
What is 30 in Roman numerals?
30 in Roman numerals is XXX.
How do you write 30 in words?
30 is written "Thirty" in English.
What number comes before XXX?
The number before XXX is 29, written XXIX in Roman numerals.
What number comes after XXX?
The number after XXX is 31, written XXXI in Roman numerals.
Related numbers
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.