Number Base Converter
Convert whole numbers between binary, octal, decimal, and hexadecimal instantly in your browser.
How to use the Number Base Converter
- Enter the number you want to convert.
- Choose its current base: binary, octal, decimal or hexadecimal.
- Choose the base to convert it to.
- Click Run to see the converted number, for example 255 in decimal = FF in hex = 11111111 in binary.
How the Number Base Converter works
In a positional number system each digit is multiplied by a power of the base. Binary 1011 means 1×8 + 0×4 + 1×2 + 1×1 = 11 in decimal. The converter reads your digits in the source base to get the value, then repeatedly divides that value by the target base to write out the new digits.
Hexadecimal uses the digits 0 to 9 and the letters A to F for 10 to 15, so each hex digit maps exactly to four binary digits, which is why programmers use hex for memory addresses, colors and byte values. Only non-negative whole numbers are supported.
Frequently asked questions
- Is this number base converter free?
- Yes. Convert numbers between bases at no cost, with no account required.
- Does it support negative numbers?
- No, only non-negative whole numbers are supported.