Binary to Decimal

Enter a binary number and convert it to decimal, hexadecimal, and octal. Results appear instantly in your browser.

Binary
Valid: 0, 1 only
Decimal (Base 10)
Result will appear here
Hexadecimal (Base 16)
—
Octal (Base 8)
—
Quick Reference
0→0
1→1
10→2
11→3
100→4
101→5
110→6
111→7
1000→8
1111→15
10000→16
11111111→255

Binary to Decimal Converter

This tool converts binary (base 2) numbers into their decimal (base 10), hexadecimal (base 16), and octal (base 8) equivalents. It is useful for understanding binary data, working with bitwise operations, or converting values from digital systems.

The conversion runs entirely in your browser using JavaScript's BigNumber library for precision.

How to use

  1. Type or paste a binary number into the input field (e.g. 11111111 or 1010).
  2. Click Convert to see the decimal, hexadecimal, and octal results.
  3. Use the Copy button to copy the decimal result to your clipboard.
  4. Click Clear to reset all fields.

What is binary?

Binary is a base 2 number system that uses only two digits: 0 and 1. It is the fundamental language of computers, where each binary digit (bit) represents an off or on state. All data in a computer — text, images, programs — is ultimately stored as binary numbers.

Example

Binary:      11111111
Decimal:     255
Hexadecimal: FF
Octal:       377