In order to create a calculator that can accurately price an option, including market volatility and changing market prices for financial instruments, you'll need to download an Excel add-on.

In Microsoft Excel, common size financial statements compare cells against the balance total to determine what percent those figures have increased or decreased.

It's not easy to create financial forecasts. When you know how to use helpful tools, like those in Excel, you can make the process more meaningful to your business. — Getty Images/ nortonrsx ...

Understand the basics of the debt-to-equity ratio, how to interpret it as a measure of financial stability, and how to calculate it in Microsoft Excel.