One of Google’s goals is that you should be able to throw just about anything into a search box (package tracking numbers, airline flight numbers, etc.) and Google will try to do something reasonable, such as return the status of a flight. Recently I was trying to reverse engineer a USB protocol and needed to convert some numbers between base 16 (hexadecimal) and base 10 (decimal). On a hunch, I threw the conversion into a Google search box. Sure enough, it worked fine.
Converting hexadecimal to decimal with a search query like [0x607a in decimal]:
Convert decimal to hexadecimal with a Google query like [1854 in hex]:
You can even convert hexadecimal to binary with a query like [0x770 in binary]:
Of course, you can also use alternate queries like [convert 0x770 to base 2]. Pretty handy.
Bonus tip: did you know that you can do currency conversion too? Just type something like [one dollar in yuan]:
If you have favorite tips for searches, leave them in the comments.