Reach

Reach is the number of people who saw your ads at least once. In Meta ads it counts people, not views, so someone who sees your ad five times adds one to your reach and five to your impressions.

What reach tells you

Reach answers one question: how many different people did this campaign put the ad in front of? It is the number to watch when the goal is to be seen by as much of an audience as possible, such as a local launch or an event.

Meta defines reach as "the number of people who saw your ads at least once during the campaign's lifetime", and adds that "reach is different from impressions, which may include multiple views of your ads by the same people". It also says the metric is "calculated using sampled data", so treat it as a close estimate, not an exact head count.

The formula reach feeds

Like impressions, reach is a count. It matters because of what you get when you divide by it:

Frequency = impressions ÷ reach

If your ads had 45,000 impressions and reached 18,000 people, frequency is 45,000 ÷ 18,000 = 2.5. The average person saw the ad two and a half times.

You can also work out what it costs to reach people. Spend divided by reach, times 1,000, gives the cost to reach 1,000 people. At $600 of spend and 18,000 people reached, that is ($600 ÷ 18,000) × 1,000 = $33.33. It runs higher than CPM because each person is counted once, however many times they saw the ad.

Reach compared with related metrics

• Reach counts people who saw the ad at least once.
• Impressions count every time the ad was on screen, repeats included.
• Frequency is the average number of views per person, impressions divided by reach.
• Clicks and results count what people did, not who saw the ad.

Reach is always lower than or equal to impressions. If the two numbers are close, almost everyone saw the ad once. If impressions are far higher, a smaller group is seeing it again and again.

Why reach stalls

Reach grows quickly at the start of a campaign and then flattens, because the people most likely to be shown the ad have already seen it. Common reasons it stops growing:

• A small audience. A narrow audience runs out of new people fast.
• A budget that is large for the audience. Extra spend ends up as repeat views, not new people.
• A short schedule. A brief campaign has less time to find new people.
• Optimization for results. A campaign built to get purchases favors people likely to buy, not the widest group.

When reach stalls and frequency rises, widen the audience, add placements or refresh the creative. Repeated views of a tired ad lead to ad fatigue in Meta ads.

Example. A neighborhood gym spends $600 over two weeks to promote a January membership offer to people within 5 miles. The campaign shows 45,000 impressions and a reach of 18,000 people, so frequency is 2.5. By the second week, reach barely moves while impressions keep rising. The gym adds a new Story video to give the same audience something fresh, and adds nearby towns to bring in new people.

In Madgicx. AI Marketer audits your Meta ad account, spots where frequency is climbing against a flat audience and prepares recommendations you approve. Creative Insights flags creative fatigue so you know when to refresh an ad.

FAQ

What is reach in Facebook ads?

Reach is the number of people who saw your ad at least once. It counts each person one time, however many times they saw it.

What is the difference between reach and impressions?

Reach counts people and impressions count views. If one person sees your ad three times, that is a reach of 1 and 3 impressions. Impressions are always at least as high as reach.

Is reach an exact number?

No. Meta says reach is calculated using sampled data, so it is an estimate. It is accurate enough to compare campaigns but won't match other systems exactly.

How do I increase my reach?

Widen your audience, add placements, raise the budget or extend the schedule. Check frequency as you go: if it climbs while reach stays flat, you are reaching the same people again.

Should I optimize for reach or conversions?

It depends on the goal. Reach suits awareness work such as launches and events. For sales and leads, optimize for the result you want and use reach to check that you are not showing ads to too few people.

Related

• Related terms: Impressions, Frequency, Cost per mille (CPM)
• In depth: Facebook reach explained

Sources

• Glossary of Reservation Terms, Meta Business Help Center