Reach

The total number of unique people who see your ad at least once. If your ad shows to 2,500 different people, your reach is 2,500, regardless of how many times each person saw it.

The distinction is simple but important:

• Reach = unique people
• Impressions = total views (one person can generate multiple)

If your ad gets 10,000 impressions but only 2,500 reach, each person saw it an average of 4 times. That ratio is your frequency, and it's one of the most useful numbers for understanding how your campaign is actually performing.

It tells you the real size of your audience. Impressions can make a campaign look bigger than it is. If you have 100,000 impressions but only 10,000 reach, you're reaching 10,000 people ten times each. That's very different from a targeting and budget perspective.

It helps you spot saturation. When your reach stops growing but impressions keep climbing, you've maxed out your audience. Everyone in your target group has already seen your ad multiple times. At that point, you either need to expand your audience, refresh your creative, or accept that you've tapped out that segment.

It connects to frequency management. The sweet spot for most campaigns is 3–7 exposures per person. Below 3, people might not remember seeing your ad. Above 7, you're likely wasting money and risking creative fatigue. Dividing impressions by reach gives you this number right away.

Facebook and Instagram let you optimize campaigns for reach, which tells the algorithm to show your ad to as many unique people as possible within your budget. This is useful for brand awareness campaigns, product launches, and announcements where you want maximum coverage.

For D2C brands launching a new product or running a flash sale, a reach-optimized campaign can put your announcement in front of your entire retargeting audience within a day or two.

But reach optimization isn't always the right move. Performance campaigns optimized for conversions or purchases will naturally sacrifice some reach to concentrate delivery on people most likely to buy. That's usually the right tradeoff for everyday campaigns.

A common mistake is thinking more reach equals better results. That's only true if the additional people you're reaching are actually relevant.

A campaign reaching 500,000 random people will almost always underperform a campaign reaching 50,000 people who actually fit your customer profile. The right question isn't "how many people did we reach?" It's "how many of the right people did we reach, and how many times?"