How to use Binary to Decimal Converter

The short answer

To convert binary to decimal, add the powers of 2 for each 1 digit: 10011100 = 128 + 16 + 8 + 4 = 156. ClickZM converts numbers of any length exactly using BigInt, supports fractions and signed two's complement, and shows the working.

It runs in your browser. What you enter is not uploaded.

How to use it

Enter your values in the fields; defaults show a worked example.

Pick the units or options that apply to you.

Read the result, which updates instantly as you type.

Check the formula note under the result to see exactly how it was worked out.

Limits worth knowing

What is 1111 in decimal? 8 + 4 + 2 + 1 = 15.

How does two's complement work? If the top bit is 1, subtract 2ⁿ: 11111011 as signed 8-bit is 251 − 256 = −5.