Binary to Decimal Converter

Enter a base-2 integer to get its decimal value.

Binary

—Binary → Decimal

Check the number representation

Keep number base, bit width, signedness and byte order explicit instead of letting one representation silently imply another.

ParseIdentify the input base or prefix before calculation.

RepresentCross-check binary, octal, decimal and hexadecimal views.

CalculateUse arithmetic or bitwise operations with exact integer scope.

Inspect bitsChoose width, signed interpretation, shifts and byte order explicitly.

Copy / verifyCopy only after checking the representation your code or protocol expects.

Base arithmetic Binary calc Hex calc Bitwise Shift Signed/unsigned Two’s complement IEEE-754 Endian

All developer-number calculations run locally. Fixed-width tools model integer bit patterns, not language-specific undefined behavior, CPU flags, binary protocol schemas or floating-point reinterpretation unless a dedicated tool says so.

Binary value inspector with signed-width evidence

Validate binary digits, convert to decimal and hexadecimal, and inspect the same bit pattern as signed two's complement at 8, 16, 32 or 64 bits.

BinaryBit widthInterpret as signed

—Decimal

—Hex

—Set bits

Ready.

Representation is context

A hexadecimal or binary string does not automatically tell you whether a value is signed, how wide it is, whether bytes are little endian, or whether the bits represent an integer or floating-point value.

Representation details that matter

Binary to Decimal Converter treats the value as an integer written in a positional numeral system. Changing the base changes the digits used to represent the number, not the underlying quantity. Leading zeroes normally carry formatting meaning only, while a minus sign represents a negative mathematical integer rather than a fixed-width two’s-complement bit pattern.

How to verify the conversion

For a quick independent check, expand a source value by place value: each digit is multiplied by a power of the source base and the terms are added. When converting back, repeated division by the destination base should reconstruct the original integer. If a protocol or file format requires an exact bit width, signedness, padding, byte order, or overflow behavior, apply those rules separately instead of assuming a plain base conversion defines them.