It looks nice, although I wonder why you'd treat each line as an independant calculation? Generally I'd enter an expression, look at the result, then stop. If

It looks nice, although I wonder why you'd treat each line as an independant calculation? Generally I'd enter an expression, look at the result, then stop. If I wanted to run multiple things I'd use a repl, which would let me copy/paste. That said it might be useful if you allowed variables to be defined, I updated my own little repl/calculator to allow that recently and found it very useful: calc> rent = 700.00 700 calc> fee = 92.00 92 calc> ( rent - fee ) * 12 7296 Allowing that makes your multiline input more useful, although I guess you would need to decide if you'd recalculate all lines using a given variable if it's value changed ..