Multi-Base Number Slider
FND-101 interactive · drag, type, or click any bit · see the same value in five bases at once · return to FND-101
Bit grid: click any bit to toggle it
Why five bases for one number?
Every base shows the same quantity, only the digits change. A computer stores the value as bits (the binary column) and reads it through whatever lens the program asks for: hexadecimal for memory dumps, octal for legacy file permissions, decimal for the user, ASCII for text.
Move the slider to 65 and the ASCII column reads 'A'. Move it to 97 and you get 'a'. That is the entire reason text files are bytes: someone agreed in 1963 that the byte 0x41 would mean the letter A. The byte does not care; the convention does.
Click any bit in the grid to flip it. Watch the decimal, hex, octal, and ASCII columns update in lockstep. Each bit position is a power of two; the sum of the on-bits is the number.