1001 binary to decimal
1001 = 9
1001 in binary is 9 in decimal. Each binary digit is worth 2 times the one to its right, which makes 1001 equal to 9 in decimal.
Nearby values
| Binary | Decimal |
|---|---|
| 100 | 4 |
| 101 | 5 |
| 110 | 6 |
| 111 | 7 |
| 1000 | 8 |
| 1001 | 9 |
| 1010 | 10 |
| 1011 | 11 |
| 1100 | 12 |
| 1111 | 15 |
| 10000 | 16 |
Frequently asked questions
What is 1001 binary in decimal?
1001 in binary is 9 in decimal. Each binary digit is worth 2 times the one to its right, which makes 1001 equal to 9 in decimal.
How do you work out 1001 binary by hand?
Each binary digit is worth 2 times the one to its right, which makes 1001 equal to 9 in decimal. The reference table on this page lists the neighbouring values so you can check the result.
Convert any value
Use the full binary to decimal converter for other values, or the number base converter for all four bases at once.