If you are not careful in collecting and analyzing the numbers you use to calculate ROI, the percentage Excel calculates will provide a false picture of you business's health.

Return on investment (ROI) measures how well an investment is performing. Learn how to calculate and interpret the ROI of your current portfolio or a potential investment.

Calculating the return One of the best methods for calculating an average return for a stock investment is the XIRR function in Excel.

Today, many CIOs and CISOs make an educated guess with no quantitative or systematic way of knowing which cybersecurity projects are best.