In Excel there are functions for that, but then I am usually in Excel so just type it in a cell. It is quicker than going to the calculator because there is a richer set of functions. And in VBA you can work in any modulo. I have one website that runs to modulo 189 - because that is nearly the maximum of single byte characters in a text variable that JavaScript can handle without belching. Hex no problem until I have to do arithmetic in it. But then there is always Excel (& VBA).

Now. Anyone still able to use a slide rule? I wonder how the Romans would have handled logarithms? The Arabs & Indians could.