A percentage gain or loss on an investment is extremely useful to investors who monitor performance. Calculating it is quite easy. Here's what you need to know.

Here's an example for a generic home-improvement project. First, calculate the percentage over budget for the total budget to get an understanding of the overall project.

A practical example of calculating the percentage over budget To use this tool in a real-world setting, start by first analyzing the percentage over budget for the entire budget.

We want to calculate the percentage of annual decline. First, we divide the most current revenue number by the beginning revenue number: $10 million divided by $15 million comes to 0.667.