Binary to Decimal Converter
Turn binary into decimal instantly.
How to use
- 1 Paste or type a binary number into the input box.
- 2 Optionally group digits with spaces or include a 0b prefix.
- 3 Read the decimal value on the right.
- 4 Copy the result for use elsewhere.
About Binary to Decimal Converter
The Binary to Decimal Converter translates a base-2 number made of 0s and 1s into its everyday base-10 value.
Type or paste your binary digits and the decimal result appears immediately, so you can check the output of a logic exercise, decode a register value, or simply learn how positional notation works without reaching for a calculator.
The parser is forgiving in the ways that matter.
It ignores spaces, so you can group nibbles like 1010 0110 for readability, and it strips an optional 0b or 0B prefix copied from source code.
A leading minus sign is honoured for negative values, and any character that is not a 0 or 1 produces a clear, specific error rather than a wrong answer.
Conversion uses JavaScript BigInt, which means there is no 32-bit or 64-bit ceiling: a binary string of hundreds of digits converts to its exact decimal equivalent with no rounding or overflow.
That makes the tool reliable for cryptography snippets, large bitmasks and teaching material alike.
Everything runs locally in your browser, so your numbers are never sent anywhere, and the converter keeps working offline once the page has loaded.
FAQ
Is there a limit on how big the binary number can be?
No practical limit. The converter uses BigInt, so even hundreds of binary digits convert to an exact decimal value without overflow.
Can I include spaces or a 0b prefix?
Yes. Spaces between digits and a leading 0b or 0B prefix are ignored, so you can paste grouped binary or values copied straight from code.