How do I track incremental profit as a result of advertising?

There are several ways to measure the effectiveness of your ads. The most common method is called cost per Impression or CPI. This metric shows how much it costs to reach 1,000 people with your ad.

You can also measure your click-through rate (CTR), which shows how many people click on your link after seeing it in an ad campaign. However, evaluating only this metric may not suffice as it doesn't consider where people click on the link and whether they buy something from you.