30 in Words
How do you write 30 in words?
The number 30 is written thirty in words. As an ordinal it is thirtieth, and on a check you would write Thirty and 00/100.
Last updated 19 June 2026
Other ways to write it
| Cardinal | thirty |
|---|---|
| Ordinal | thirtieth |
| Currency | thirty dollars |
| Check format | Thirty and 00/100 |
How number-to-words spelling works
A cardinal number names a quantity (thirty), while an ordinal names a position (thirtieth). English hyphenates compound numbers from twenty-one to ninety-nine and groups digits into thousands, millions, and billions.
For house-style rules on spelling out numbers, see the Chicago Manual of Style, or read our guide to spelling numbers in words.
Facts about 30
- 30 is an even number.
- It is not a prime number.
- Digit sum: 3.
- Roman numerals: XXX.
- Binary: 11110.
- Hexadecimal: 1E.
| Digit | Place |
|---|---|
| 3 | tens |
| 0 | ones |
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Frequently asked questions
How do you write 30 in words?
30 in words is "thirty".
How do you spell 30?
30 is spelled "thirty".
How do you write 30 on a check?
On a check, write "Thirty and 00/100".