Online Tools Harbor18 in every format
| In words | eighteen |
|---|---|
| Uppercase | EIGHTEEN |
| On a check (cheque) | Eighteen dollars and 00/100 |
| Ordinal | 18th · eighteenth |
| Roman numerals | XVIII |
| US / UK format | 18 |
| European format | 18 |
| Scientific notation | 1.8 × 10^1 |
| Binary | 10010 |
| Hexadecimal | 12 |
| Even / odd | Even · not prime |
Frequently asked questions
How do you write 18 in words?
18 is written as "eighteen".
How do you write 18 on a check?
Write "Eighteen dollars and 00/100" on the amount line and 18.00 in the box.
What is 18 in Roman numerals?
18 in Roman numerals is XVIII.
What is the ordinal of 18?
The ordinal form is 18th ("eighteenth").
Spell out any number with the Number to Words Converter, or convert to Roman numerals with the Roman Numeral Converter.