Convert numbers between binary, octal, decimal, and hexadecimal
Digits 0-9
Enter a number to see all base conversions
Full-featured scientific calculator with trigonometry, logarithms, and history
Solve linear and quadratic equations with step-by-step results
Check if a number is prime, find prime factorization, or list primes in a range
Generate Fibonacci numbers by count or up to a maximum value
Number Base Converter is a free online tool that converts numbers between four common bases: binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Enter a number in any base and instantly see its representation in all other bases. Essential for programmers, computer science students, and anyone working with digital systems. Binary is the language of computers, hexadecimal is used for memory addresses and color codes, and octal appears in Unix file permissions. All processing happens in your browser.