XXX is a single Roman symbol group for 30.
How 30 is written in Roman numerals
The number 30 is written XXX in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.
Building XXX step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| X | 10 | 30 | 20 |
| X | 10 | 20 | 10 |
| X | 10 | 10 | 0 |
Where you see XXX
Regnal and papal names use it the same way — a 30th ruler of a name is styled XXX, as in Louis XXX or Pope John XXX. The 30th Super Bowl was Super Bowl XXX; the NFL has used Roman numerals for every edition except Super Bowl 50.
Nearby numbers
Popular numbers in Roman numerals
Frequently Asked Questions
What is 30 in Roman numerals?
30 in Roman numerals is XXX. Reading it left to right gives X (10) + X (10) + X (10) = 30. The number below it, 29, is written XXIX, and the number above it, 31, is written XXXI.
How do you write 30 in Roman numerals?
Write 30 as XXX, combining X (10) + X (10) + X (10). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 30 in 3 steps: X leaves 20, X leaves 10, X leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XXX is the only standard spelling of 30.
What are the Roman numerals either side of 30?
Either side of 30 the Roman numerals are XXIX for 29 and XXXI for 31, with XXX between them. Those three numerals are 4, 3 and 4 letters long, so the length changes as you count. Roman numerals have no digit positions, so each step can rewrite the numeral rather than bumping a single digit.
What is 30 times ten in Roman numerals?
30 times ten is 300, which is CCC in Roman numerals, not XXX with a letter added on the end. Roman numerals have no place value, so multiplying by ten respells the whole numeral instead of shifting digits along. Compare XXX for 30 with CCC for 300.