Convert between decimal and binary, or do arithmetic directly on binary numbers.
Binary numbers only use the digits 0 and 1, so the input strips out any other character as you type to keep the value valid for conversion or arithmetic.
It converts both binary inputs to decimal, applies the chosen operation (+, −, ×), and converts the result back to binary — the decimal equivalent is also shown underneath for reference.
Once you convert a number, the calculator also displays that same value in octal, decimal, and hexadecimal, so you can see how one quantity looks across the common number bases.