1001101011

write it backwards, like this: 1101011001

then calculate the decimal number like this:

1*2^0+1*2^1+0*2^2+1*2^3+0*

The coefficients of 2^0, 2^1, 2^2, 2^3....2^9, are the digits of your binary number written backwards.

The result of the conversion from binary to decimal in this case is: 619

You can write a little program to take each part of your binary number, perform each multiplication and calculate the sum.

Your question is a little confusing. I hope this is what you wanted to know.

Regards,

Wesley