Number Base Converter - Free Online | FunToolX
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About this tool
Number Base Converter is a free online math tool. Convert between binary, octal, decimal, hex. Solve calculations and learn with ease. It runs entirely in your browser — no download or sign-up needed.
Enter a number, select source and target binary, and the tool immediately converts and displays the result. Supports base 2-36, common ones are binary (0/1), octal (0-7), decimal (0-9), and hexadecimal (0-9/A-F). You can also customize the base, such as base 12 or base 20.
Conversion principle: Numbers in arbitrary binary system are first converted to decimal system (weighted expansion and summation), and then converted from decimal system to target binary system (divide-base method). For example, binary 1010 to decimal: 1×2³ + 0×2² + 1×2 ³ + 0×2 = 10.
Programmers often use hexadecimal to represent color values (#FF0000 red) or memory addresses, and binary is used for bit operations. The tool displays the conversion process in real time to help understand the concept of binary.
Binary conversion tool supports mutual conversion between binary, octal, decimal, hexadecimal and other arbitrary bases, and can customize the binary range.