Until recently I used CLISP for this purpose, it is slightly easier to do casual arithmetic in it than the fixnum only paradigm in picolisp, and it loads slightly faster than SBCL.
However, stack languages are even better for quickly expressing everyday math, so once I got Factor compiled and running on my boxes it has replaced CLISP as my go-to language for doing calculator stuff.
Until recently I used CLISP for this purpose, it is slightly easier to do casual arithmetic in it than the fixnum only paradigm in picolisp, and it loads slightly faster than SBCL.
However, stack languages are even better for quickly expressing everyday math, so once I got Factor compiled and running on my boxes it has replaced CLISP as my go-to language for doing calculator stuff.
factorcode.org