Binary Calculator Online

This tool exists because I was exhausted by doing binary math by hand during networking exams and subnetting tasks. Doing 1011 + 1101 on paper is highly prone to "carry the one" errors. This calculator lets you perform instant addition, subtraction, multiplication, and division natively in Base-2.

How It Handles Math

Under the hood, the calculator takes your binary strings, parses them into Base-10 integers so the JavaScript engine can perform perfectly accurate math, and then converts the quotient or product back into a clean Base-2 string. Because of this, it handles negative numbers flawlessly (e.g., subtracting 11 from 10 yields -1).

Division and Remainders

Keep in mind that binary division in computer science usually focuses on the integer quotient (similar to bitwise shifting). If you divide 101 (5) by 10 (2), this tool will output 10 (2), discarding the remainder. This mimics how low-level systems actually process integer division.

A Helpful Sanity Check

To make sure you know exactly what the math is doing, This includes a real-time decimal output next to the binary result. This way, if you multiply 10 by 10, you can instantly verify that the output 100 actually means 4 in decimal.