I usually use the Casio FC-200V which is, in my humble opinion, the greatest Financial Calculator out there. I had to buy this calculator for a class and wish I didn't need it. It feels like Dollar Store level quality in my hands, only has one line for numbers (especially annoying if you're dealing with cash flows or payment calculations), and is almost too lightweight. Unfortunately, every calculation in our finance class is done on this calculator. I'm pretty sure there's some sort of backdoor business dealing between Texas Instruments and every college textbook manufacturer out there because there is no other explanation for why every business finance course requires this clunky piece of junk.