Convert 1001 binary to decimal

Here we will tell you what 1001 binary is converted to decimal and then show you how we converted it. 1001 binary converted to decimal is as follows:

1001 = 9

Here is how to convert 1001 binary to decimal:

Step 1) Note that there are 4 digits in 1001. That means there are 4 positions - the first position is the digit furthest to the right.

Step 2) Multiply the number in the first position by 2⁰ (=1), the second position by 2¹ (=2), the third position by 2² (=4) and so on. (See Table 1 for longer list.) Here is the math for the 4 digits in 1001:

1 x 1 = 1
0 x 2 = 0
0 x 4 = 0
1 x 8 = 8

Step 3) Finally, add up the answers from Step 2 to get the answer to 1001 binary converted to decimal:

1 + 0 + 0 + 8 = 9

Once again, the answer is as follows:

1001 = 9

Table 1:
Here is the list of what you multiply each position in a binary number by to get the decimal:

Pos 1 = 2⁰ = 1
Pos 2 = 2¹ = 2
Pos 3 = 2² = 4
Pos 4 = 2³ = 8
Pos 5 = 2⁴ = 16
Pos 6 = 2⁵ = 32
Pos 7 = 2⁶ = 64
Pos 8 = 2⁷ = 128
Pos 9 = 2⁸ = 256
Pos 10 = 2⁹ = 512
Pos 11 = 2¹⁰ = 1024
Pos 12 = 2¹¹ = 2048
Pos 13 = 2¹² = 4096
Pos 14 = 2¹³ = 8192
Pos 15 = 2¹⁴ = 16384
Pos 16 = 2¹⁵ = 32768

Remember, the first position is on the right and last position is on the left.

Binary to Decimal Converter
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