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Number Base Converter

Convert between binary, octal, decimal, and hexadecimal numbers

Binary (Base 2)
Octal (Base 8)
Decimal (Base 10)
Hexadecimal (Base 16)
About Number Bases
Binary (Base 2)

Foundation of computers. Uses only 0 and 1

e.g., 1010 = 10
Octal (Base 8)

Uses digits 0-7

e.g., 12 = 10
Decimal (Base 10)

Everyday numbers using digits 0-9

e.g., 10 = 10
Hexadecimal (Base 16)

Uses 0-9 and A-F. Common for color codes

e.g., A = 10

Enter a number in any field to automatically convert it to other number systems. Useful for programming, computer science, and digital circuit design.

About this tool

The Base Converter translates numbers between binary, octal, decimal, and hexadecimal in real time. Every base is shown side by side, so you can verify your conversion at a glance instead of switching between calculators.

Common use cases

  • Inspect hex color codes, byte values, or bitmasks while writing CSS or low-level code.
  • Cross-check register values when debugging embedded systems or firmware.
  • Convert IP-related numbers or subnet calculations during network troubleshooting.
  • Practice number-system problems for computer science coursework or interviews.