1,000,000,000 in Words
How do you write 1,000,000,000 in words?
The number 1,000,000,000 is written one billion in words. As an ordinal it is one billionth, and on a check you would write One billion and 00/100.
Last updated 19 June 2026
Other ways to write it
| Cardinal | one billion |
|---|---|
| Ordinal | one billionth |
| Currency | one billion dollars |
| Check format | One billion and 00/100 |
How number-to-words spelling works
A cardinal number names a quantity (one billion), while an ordinal names a position (one billionth). 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 1,000,000,000
- 1,000,000,000 is an even number.
- It is not a prime number.
- Digit sum: 1.
- Binary: 111011100110101100101000000000.
- Hexadecimal: 3B9ACA00.
| Digit | Place |
|---|---|
| 1 | 10^9 |
| 0 | 10^8 |
| 0 | 10^7 |
| 0 | millions |
| 0 | hundred-thousands |
| 0 | ten-thousands |
| 0 | thousands |
| 0 | hundreds |
| 0 | tens |
| 0 | ones |
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Frequently asked questions
How do you write 1,000,000,000 in words?
1,000,000,000 in words is "one billion".
How do you spell 1,000,000,000?
1,000,000,000 is spelled "one billion".
How do you write 1,000,000,000 on a check?
On a check, write "One billion and 00/100".