Binary to Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal — arbitrary size, entirely in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the number base converter with binary (base 2) as the source and decimal (base 10) as the target already selected — type the 0s and 1s and run the conversion.
Binary works in powers of two: each position doubles the one to its right. To read 1011, add the weights of the set bits — 8 + 0 + 2 + 1 = 11 in decimal.
The full tool also converts octal and hexadecimal in any direction and shows every result in all four bases at once. BigInt arithmetic means no length limit, and everything runs locally in your browser — the numbers never leave it.
Example. Decimal 255 converts to hexadecimal ff, binary 11111111, and octal 377.
Limit. The only bases are 2, 8, 10, and 16, and a digit that does not belong in the source base is rejected.