Online Tools Harbor1 in every format
| In words | one |
|---|---|
| Uppercase | ONE |
| On a check (cheque) | One dollars and 00/100 |
| Ordinal | 1st · first |
| Roman numerals | I |
| US / UK format | 1 |
| European format | 1 |
| Scientific notation | 1 × 10^0 |
| Binary | 1 |
| Hexadecimal | 1 |
| Even / odd | Odd · not prime |
Frequently asked questions
How do you write 1 in words?
1 is written as "one".
How do you write 1 on a check?
Write "One dollars and 00/100" on the amount line and 1.00 in the box.
What is 1 in Roman numerals?
1 in Roman numerals is I.
What is the ordinal of 1?
The ordinal form is 1st ("first").
Spell out any number with the Number to Words Converter, or convert to Roman numerals with the Roman Numeral Converter.