Marketing reach refers to the estimated number of potential customers that a marketing campaign can reach with its message or content. It is a measurement of the size of the audience that has seen the ads or campaign content. Reach measures the actual audience, while marketing reach measures the potential customers a campaign could reach. It can refer to specific audience segments or to a broader percentage of the population.

Marketing reach is important because it measures the audience of the ads, and it can also help analyze the effectiveness of the ads. For example, a high reach with low conversions can lead to questioning why customers aren’t engaging with the ads. By knowing the size of the audience, one can determine what the goals for conversions and sales should be.

Marketing reach is often calculated as the number of customers who have seen the ad at least once. Impressions, on the other hand, refer to how many times the ad was displayed. The basic formula for calculating reach is impressions divided by frequency.

It is important to note that the term "reach marketing" can also refer to a company called Reach Marketing, which is a full-service email marketing agency that provides business email lists and sales and marketing automation processes.