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Number Base Converter

Convert between binary, octal, decimal, hex

🔢Number Base Converter

Positional number systems use a base (radix). Base 10 (decimal): 0–9; Base 2 (binary): 0–1; Base 16 (hexadecimal): 0–9 and A–F. Computers operate in binary; hex is shorthand for binary in programming.

  1. 1To decimal: digit × base^position, summed
  2. 2From decimal: repeatedly divide by base, collect remainders
  3. 3Each hex digit = exactly 4 binary bits
Binary 11111111=Decimal 255 · Hex FF · Octal 377255 = 2⁸ − 1

Fun Fact

Computers use binary because electronics only need two states: on/off — far simpler to engineer than the 10 states needed for decimal.

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