How often do you use your computer to actually compute something?

I use a spread sheet for finances and as a database to organize information on a number of subjects and projects. (MS EXCEL) I have used The computer for drafting plans for projects, and to develop suspension components with Autocad programs (putting parts in motion with simulation to test theory.) Have also used it for drawing plans for small building construction as well. I guess that is considered that computing as well, at least I do.