From Dynamic Bottom Lines:
DBLCalc is a free Excel spreadsheet that records and calculates 13 Financial Ratios and 2 Reports. The comprehensive User Guide discusses each ratio in detail, explaining how it is calculated, how to use it, and what corrective action should be taken to improve future performance. Ratio Analysis is a widely practiced method of analyzing and interpreting financial statements using Financial Ratios or Key Performance Indicators (KPI). Most ratios are calculated from the information found in your company's financial statements. You can compare today's numbers with historical figures to see where you are coming from and where you are going to. Ratio Analysis allows you to compare (benchmark) your performance against industry standards, as well as successful businesses in other industries. It can predict and often provides advanced warnings of potential future problems.