ChatQalc

https://modrinth.com/mod/chatqualc-fabric

An interface to Qalculate! qalc - the best cli calculator. (Included for Windows/Linux)

Features

• Installs and runs portable interactive qalc cli calculator when you start Minecraft
• Operates in chat screen (T or /)
• NumPadEnter or Ctrl+Enter = Send message to qalc instead of chat
• Ctrl+Tab = Convert last expression without spaces to calculated result (escape spaces with \)
• Shift+Enter = Send message to qalc and replace chat field with last line of the result (You can look at the result and decide to share it with everybody by pressing Enter)
• Ctrl+Shift+Enter = Same as Ctrl+Enter, but result is broadcast from your name to the whole server. And without colors. (Use when you want to share multiple lines)
• Shift+Tab = Get completions
• Chat history of your queries. Very helpful.
• Open config in ModMenu to get a graphical interface. All settings are there. (Edit tab)
• Some Minecraft-related units and variables (100it = 1 stack + 36 items) it st sb pdc pdcwh gt iph hs, ch|chunk|chunks

Qalculate! features

https://qalculate.github.io/features.html

Manual: https://qalculate.github.io/manual/qalc.html

Most notably:

• /help then Ctrl+Enter
• Use -> for unit conversion (1km->m = 1000 m)
• Fault-tolerant parsing of strings (almost natural language)
• Ability to disable functions, variables, units or unknown variables for less confusion: e.g. when you do not want (a+b)^2 to mean (are+barn)^2 but ("a"+"b")^2
• Verbose error messages, Arbitrary precision
• Symbolic calculation
• Functions, Units, Variables, Constants (persistent between restarts)
• Gnuplot (opens a new window with plot, you have to install GNUplot separately for it to work)
• Comments start with #

You can get a 30KB noinstall version if you install or link Qalculate to ./minecraft/config/chatqalc/ manually or run the full version once.