Python makes a pretty nice interactive calculator. You can do the other way around, too, with the builtin function bin(x). (And there are also hex() and oct() builtins, if you also need to go back ...

Binary and hexadecimal numbers systems underpin the way modern computer systems work. Low-level interactions with hexadecimal (hex) and binary are uncommon in the world of Java programming, but ...

The 17th-century philosopher and mathematician developed the binary number system that is still being used today, but his approach to writing in binary code made direct references to the hexagrams ...