9 in Binary

Decimal 9 equals 1001 in binary.

Decimal → Binary

9=1001

Open 9 in the interactive decimal to binary converter →

9 in all number bases

Decimal9

Hexadecimal0x9

Binary1001

Octal11

How 9 converts from decimal to binary

Divide by 2 repeatedly and keep each remainder, then read the remainders from bottom to top:

9÷ 2 =4remainder1

4÷ 2 =2remainder0

2÷ 2 =1remainder0

1÷ 2 =0remainder1

Result (remainders bottom to top): 1001