If you're looking for an upgrade and/or do low-level stuff, the TI-36X Solar handles binary, hexadecimal, and octal quite nicely (though you do start running ou

If you're looking for an upgrade and/or do low-level stuff, the TI-36X Solar handles binary, hexadecimal, and octal quite nicely (though you do start running out of digits if you're trying to convert big numbers to binary). It also has a number of logic functions that you may or may not find useful. Lately, I've been delighted by the equally competent fraction input/display system. I've been doing a lot of woodworking in US customary units, and the 36X beats the pants off of any other calculator I've owned[0]. Truly, it's a well thought-out little tool. So much so that when the display on mine pooped out, I went on eBay and found another one for 10 USD shipped. [0] If somebody wants to recommend a dedicated builder's calculator that handles fractional inches handily, I'm all ears, but I haven't owned one to this point. Calculating board-feet would be a nice plus.