How to use Decimal to Binary Converter

The short answer

To convert decimal to binary, divide by 2 repeatedly and read the remainders from bottom to top: 156 → 10011100. ClickZM handles huge integers, fractions and negative numbers (two's complement at 8, 16, 32 or 64 bits).

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 10 in binary? 1010.

Why can't 0.1 be written exactly in binary? Like 1/3 in decimal, 0.1 repeats forever in binary (0.000110011…), which is why computers show 0.1 + 0.2 = 0.30000000000000004.