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Calculator recommendation?

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CH1:
I'm gonna get roasted for this, but I do think the 991es or 991ex from casio has one of the easiest interface for variable subbing and equation solving, since everything is shown as if its written on paper.
I do own a Swissmicros DM42 and I use it much more often than the casio; for simpler calculations, RPN really can't be beat. But when I see an equation too long to fit in my head and don't want to wait for MATLAB to open, I just reach for the casio.

bd139:
I use mostly excel. And for everything else it’s an HP35s. The 35s is programmable RPN so you can enter a few keystrokes to record a program then execute it many times for different values. Plus they’re new and you can still get them without having to argue with second hand ones which are invariably broken or smell of cigarettes.

MikeK:
Just got a TI-83 off Craigslist, for free.   :-+  Just have to fix the battery-to-PCB contacts. 

TimNJ:
What kind of phone do you have? I use Archimedes for iOS. It’s the best implementation of “visually perfect” input I’ve ever used. Does algebra no problem. I’ve made enough detrimental algebraic rearranging mistakes that I really appreciate that it just let’s you put in an equation in the form you know/remember, and can solve for you. Some old school engineers would probably scoff at it, but whatever.

Dubbie:
I really like desmos on my phone for graphing.
For general purpose arithmetic, I like my swissmicros DM42 HP clone.

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