Number
30 in Roman numerals
30 is written XXX
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How XXX is built
Roman numerals are written one decimal place at a time, largest first.
- XXXtens · 3X written 3 times: 3 × 10 = 30.
Mistakes to avoid
- There's no letter for zero. The zero is simply left out, which is why 30 has 1 part, not 2.
About the number 30
- 30 is even and can be split into prime factors: 2 × 3 × 5, or in Roman numerals II × III × V.
- XXX has 3 letters. 907 of the numbers up to 1,000 have longer numerals.
- As a day of the month, XXX is the 30th. Write a date
Counting from 21 to 30
Every number from 21 to 30 starts XX (20); only the ending changes.
| Number | Roman numeral |
|---|---|
| 21 | XXI |
| 22 | XXII |
| 23 | XXIII |
| 24 | XXIV |
| 25 | XXV |
| 26 | XXVI |
| 27 | XXVII |
| 28 | XXVIII |
| 29 | XXIX |
| 30 | XXX |