Free OnlineCalculators & Converters
Number System Converter
Convert between decimal, binary, octal, and hexadecimal number systems. Translate numbers across different bases instantly.
number system converterbinary to decimalhex to decimaloctal converterbase converter
Valid characters: 0-9
Key Features — Number System Converter
Decimal, binary, octal, and hexadecimal conversion
Custom base conversion (base 2 through 36)
All four representations shown simultaneously
Step-by-step conversion explanation
Handles large numbers accurately
Why Use This Tool — Number System Converter
Free Online Number system converterBinary to decimal — for EveryoneFast & Easy Hex to decimalOctal converter — 100% FreeFree Online Base converter
Privacy First
All processing happens in your browser. Your data never leaves your device.
Lightning Fast
Get instant results with zero wait time. No server delays, no loading screens.
Works Everywhere
Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — Number System Converter
What are the most common number systems in computing?
Binary (base 2) uses digits 0-1 and is the native language of computers. Octal (base 8) uses digits 0-7 and represents three binary digits. Decimal (base 10) uses digits 0-9 and is the human standard. Hexadecimal (base 16) uses digits 0-9 and letters A-F, representing four binary digits.
How do I read hexadecimal numbers?
Hexadecimal uses 0-9 for values zero through nine and A-F for values ten through fifteen. Each hex digit represents four binary bits. The hex number 1F equals 31 in decimal (1×16 + 15×1). Hex is commonly used for color codes (#FF5733), memory addresses, and MAC addresses.
Can I convert to any base, not just 2, 8, 10, and 16?
Yes. The tool supports custom base conversion for any base from 2 through 36. Base 36 uses all digits 0-9 and letters A-Z. This is useful for specialized encoding schemes and mathematical exploration.