Home » Developer Tools » Binary to Decimal Converter
Enter a binary value and get its exact decimal value, with the place value working shown.
Binary digits only (0 and 1). Whole numbers only. Conversion runs in your browser, so nothing is uploaded.
Binary is base 2, the number system computers use, and decimal is the base 10 system we count with. The Binary to Decimal Converter turns a binary value into its everyday decimal number.
This is the reverse direction of the existing Decimal to Binary Converter. It does not replace that tool. It simply lets you convert the other way, from binary back to decimal.
Take each bit, from right to left, starting at position 0. Multiply the bit by 2 to the power of its position, then add all the results. Bits that are 0 add nothing.
Yes, it is completely free with no sign up and no limits. You can convert as many binary values as you like.
Yes. You can enter a binary value with or without the 0b prefix, for example 0b1101 or 1101, and both give 13.
This tool is the reverse direction. The Decimal to Binary Converter turns a decimal number into binary, and this tool turns binary back into decimal. It does not replace that tool.
Yes. The converter uses BigInt arithmetic, so very long binary values convert exactly, with no rounding.
No. This tool converts whole binary numbers only. A binary point or any other character gives a clear error message.
No. All conversion happens in your browser on your own device, so your values never leave your computer.
To convert the other way, try the Decimal to Binary Converter, and for the hex form, try the Binary to Hex Converter.