I used to use this back when I mained Windows. Ever since moving primarily to Linux, and getting familiar with Emacs, Calc mode simply beats every calculator I've ever used in total functionality. However, there are certain cases where I also like to use https://insect.sh if lots of units are involved.
Emacs Calc (not unlike much of the rest of Emacs) is a little ... special. By default, it calculates 4/2*2 as 1, because multiplication has a higher precedence than division.
I think some people learned P-E-MD-AS as if MD and AS didn't have the same precedence. I mean, it's a convention anyway, so they aren't really "wrong" insomuch as just being unusual. But it does seem like an odd thing to disagree about.
I think there's also some confusion about whether the / symbol is actually being used as a single line equivalent to a fraction, which might introduce some ambiguity? I forget. The number of ways that people can misunderstand things is infinite, so it can be hard to keep track.
Anyway, parentheses are cheap and misunderstandings, even when the other party ought to take the blame, can be expensive, so I've taken up the habit of being generous with the things.
This may be slightly off topic, but what are some other small, lesser known websites like this one that people use regularly? For me, it'd be https://rubular.com and https://crontab.guru. I've used those 2 sites pretty regularly across my entire career.
I've been using and loving qalculate for years as part of Debian but strangely it isn't in the current Debian stable package list (bullseye). So I just switched to SpeedCrunch and it seems like a good replacement for most quick calculations where you still want to see some history.
I'm using Emacs in a floating window under I3wm that I can toggle into the scrap buffer and back with a key binding. Doing the same with one terminal. This inspiration for this also came from the console in Quake.
