This free online binary to decimal calculator will convert binary numbers into decimal numbers and display a conversion chart to show how it arrived at the answer.
A binary number is a number that consists of only 1s and 0s. Binary numbers use the base 2 system (hence the "bi" in binary), as opposed to decimal numbers that use the base 10 system.
In other words, the decimal system (base 10) uses only the digits 0,1,2,3,4,5,6,7,8 and 9, whereas the binary system (base 2) uses only the digits 0 and 1.
To differentiate between a base 2 and a base 10 number, base 2 numbers are usually written with a 2 as the subscript. For example, 101_{2} would tell you that the number is the binary number onezeroone, and not the decimal number onehundredone.
In order to help you to understand how to convert binary to decimal, it may help to look at how we translate the value of a decimal number. Lets use the decimal number 1234 (1234_{10}, or onethousand, twohundred and thirtyfour) as an example:
A  Power of 10:  10^{3}  10^{2}  10^{1}  10^{0} 
B  Place value (A result):  1000  100  10  1 
C  Entered decimal digit:  1  2  3  4 
D  Product of B * C:  1000  200  30  4 
E  Cumulative total of D:  1000  1200  1230  1234 
With the above base 10 translation in mind, here is how you would convert the base 2 number 1111 (1111_{2} or oneoneoneone) into a base 10 number:
A  Power of 2:  2^{3}  2^{2}  2^{1}  2^{0} 
B  Place value (A result):  8  4  2  1 
C  Entered binary digit:  1  1  1  1 
D  Product of B * C:  8  4  2  1 
E  Cumulative total of D:  8  12  14  15 
As you can see, converting a binary number to a decimal number is a simple process of identifying the place value of each digit, multiplying each digit by its place value, and then adding up all of the products.
If the base 2 you want to convert has a decimal point in it, you simply continue subtracting 1 from each exponent (line A below) as you move from left to right. For example, here is how you would convert 111.101_{2} into its base 10 equivalent:
A  Power of 2:  2^{2}  2^{1}  2^{0}  2^{1}  2^{2}  2^{3} 
B  Place value (A result):  4  2  1  0.5  0.25  0.125 
C  Entered binary digit:  1  1  1  1  0  1 
D  Product of B * C:  4  2  1  0.5  0  0.125 
E  Cumulative total of D:  4  6  7  7.5  7.5  7.625 
So you see, in a binary number each place value to the right of the decimal point decreases by 1/2 (> 1/2, 1/4, 1/8, etc.) as opposed to the place values to the left of the decimal point whose values double with each place you move to the left (8, 4, 2, 1 <).
With that, let's use the Binary to Decimal Converter to convert base 2 to base 10.

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