30 in Words – How to Spell 30
30 = Thirty
30 is written “thirty” in English.
Step by step
- Split 30 into groups of three digits: 30.
- Write each group as hundreds, tens and ones, hyphenating 21–99.
- Join the groups: Thirty.
As an ordinal (for dates, rankings and anniversaries), 30 becomes “thirtieth”, abbreviated 30th.
Details
- In words
- Thirty
- For a check
- Thirty and 00/100 dollars
- Uppercase
- THIRTY
- Digits
- 2
- Roman numerals
- XXX
How it works
English numbers are read in groups of three digits — ones, thousands, millions and so on. Each group is spoken as hundreds, tens and units, compound numbers from twenty-one to ninety-nine take a hyphen, and in American usage the word “and” is saved for the decimal point. On a check, the cents follow as a fraction over 100.
Nearby values
Related conversions
Frequently asked questions
How do you spell 30?
Thirty.
How do I write 30 dollars on a check?
Thirty and 00/100 dollars.
Is there a hyphen in 30?
No — this number has no compound tens-and-ones part.
What is 30 in Roman numerals?
XXX.