Binary Calculator
Convert between decimal and binary number representations.
Calculate
Enter your values below.
Result
Result
0
Formula used
Decimal-to-binary conversion repeatedly divides by 2, recording remainders; binary-to-decimal sums each digit times its power of 2.
Example: 42 in decimal = 101010 in binary.
How to use this calculator
- Enter Decimal number, Binary number.
- Choose Direction.
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
What is binary?
A base-2 number system using only the digits 0 and 1 — the foundation of digital computing.
Can I convert negative numbers?
This tool covers non-negative integers; negative binary representations (like two's complement) vary by bit width.
What characters are valid in a binary number?
Only 0s and 1s.
How large a number can I convert?
Any value JavaScript can represent as a safe integer.