10000000 in Decimal
Binary 10000000 equals 128 in decimal.
Why this number matters: 128 is 2⁷ - the sign bit of an 8-bit integer. As a signed byte it wraps around to -128.
10000000 in all number bases
Decimal128
Hexadecimal0x80
Binary1000 0000
Octal200
Try another value
Edit this value or switch its base. Your changes are calculated in your browser with exact integer arithmetic.
Input base:
Decimal
128Hex
0x80Binary
0b10000000Octal
0o200How 10000000 converts from binary to decimal
Multiply each digit by 2 raised to its position (starting at 0 from the right), then add the results:
1× 27 = 1 × 128 = 128
0× 26 = 0 × 64 = 0
0× 25 = 0 × 32 = 0
0× 24 = 0 × 16 = 0
0× 23 = 0 × 8 = 0
0× 22 = 0 × 4 = 0
0× 21 = 0 × 2 = 0
0× 20 = 0 × 1 = 0
Sum: 128
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