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Number Base Converter

Convert numbers between decimal, binary, hexadecimal, octal, and Roman numerals.

Decimal (Base 10)
42
Binary (Base 2)
101010
Hexadecimal (Base 16)
0x2A
Octal (Base 8)
0o52
Roman Numeral
XLII

How to Use Number Base Converter

  1. Enter a number in any supported format
  2. Select the input format (decimal, binary, hex, octal, or roman)
  3. Click Convert to see the number in all formats
  4. Copy any result with one click

Supported Number Systems

  • Decimal (Base 10) - Standard number system (0-9)
  • Binary (Base 2) - Computer number system (0-1)
  • Hexadecimal (Base 16) - Used in programming (0-9, A-F)
  • Octal (Base 8) - Unix permissions (0-7)
  • Roman Numerals - Ancient number system (I, V, X, L, C, D, M)

Features

  • Convert between all number bases instantly
  • Support for Roman numerals (1-3999)
  • One-click copy for any format
  • Works entirely in your browser - no data is sent to any server