The Microsoft Office family of software contains a program called Excel. It is a spreadsheet tool that allows you to perform anything from simple calculations to create complex combinations of tables to use for budget presentations and everything else you need to figure out by numbers. Graphical charts can be generated based on columns and rows, formulas and macros in the spreadsheet. If money is an issue, I’d consider OpenOffice’s Calc (from www.openoffice.org), which is free software that can do most of the same tasks as MS Excel. It’s also compatible with MS Excel, meaning you can work with an Excel spreadsheet in Calc, and save it as either Calc or Excel format.