Creating an Excel Sales Tax Formula Excel doesn't have a built-in sales tax formula, but adding one is only a matter of multiplying your price by the tax rate.

By dividing the food costs by the total food sales, you arrive at your food costs. What is the formula for cost of goods? In other words, to calculate COGS, you need to multiply starting inventory by ...

Microsoft Excel is a spreadsheet software with legions of fans. Learning Excel and its functions and formulas can be tricky, but here are the basics.