Add, subtract or multiply two binary numbers and see the binary and decimal results.
Try an example
Load a ready-made sample into this tool and run it. Every result you see is calculated live by the tool itself — nothing here is a pre-written answer.
Sample: a: 1010; op: +; b: 1100
How to Use
- Enter two binary numbers using only 0 and 1.
- Choose the operation.
- Read the binary and decimal results.
What this binary calculator does
This binary calculator adds, subtracts or multiplies two binary numbers and shows the result in binary alongside its decimal value. Enter both numbers using only the digits 0 and 1, choose one of the three operations offered, and the calculation is performed in base two — the arithmetic computers themselves use — without you converting back and forth by hand at every step.
How binary arithmetic works
Binary place values double from the right — 1, 2, 4, 8, 16 — instead of rising by tens as decimal places do. Addition carries when a column reaches two, subtraction borrows in twos, and multiplication shifts and adds. The calculator follows those base-two rules directly, then also displays the familiar decimal reading of the outcome.
Good to know
Only the digits 0 and 1 are accepted; any other character is rejected, because letters and digits above one have no meaning in base two. Subtraction that would produce a negative result shows an error instead of an answer — this calculator works with positive binary numbers and plain subtraction between them.
Frequently asked questions
What operations can it perform?
Addition, subtraction and multiplication of two binary numbers. The answer appears in binary with its decimal equivalent beside it, which makes checking homework or low-level computing arithmetic straightforward.
Why was my input rejected?
Binary uses only 0 and 1. Any other digit or character — a 2, a letter, a decimal point — cannot be read as a binary number, so the calculator asks for a valid entry.
Can it subtract a larger number from a smaller one?
No. A larger second number would make the result negative, and this calculator reports an error instead. Swap the operands if you need the size of the difference between them.
How to use Binary Number Calculator
- Enter two binary numbers using only 0 and 1.
- Choose the operation.
- Read the binary and decimal results.
Limitations
Only the digits 0 and 1 are accepted; subtraction that goes negative shows an error.