What is Reach?

Why It Matters

Reach tells a media buyer whether a budget is being spread across a lot of different people or concentrated on the same audience seeing the ad over and over. Without it, a big impressions number can look impressive while actually reflecting a small, saturated audience rather than genuine new exposure. It's the metric that answers the specific question of how many people a campaign is introducing a brand to, which matters most for awareness-stage campaigns where breadth is the goal. Reading it alongside frequency reveals the real shape of a media plan, wide and shallow versus narrow and repeated, a distinction that changes how a budget should be allocated. Teams optimizing for reach typically cap frequency deliberately, since letting frequency run unchecked eats into the budget that could otherwise be reaching new people.

Example

A campaign delivers 500,000 impressions but reaches only 150,000 unique people, meaning the average person in that audience saw it roughly 3.3 times. A campaign built to maximize reach might deliberately cap frequency low to spread a fixed budget across as many unique people as possible, while a campaign built around frequency accepts a smaller reach in exchange for showing the ad to the same people repeatedly. Reading reach and frequency together shows how a media budget is actually being spent, wide and shallow versus narrow and repeated.

Frequently Asked Questions

• What's the difference between reach and impressions?

  Impressions count every individual ad display, including repeat views from the same person. Reach counts only unique people, deduplicated regardless of how many times each one saw the ad.

• How do you calculate frequency from reach?

  Frequency is impressions divided by reach. A campaign with 500,000 impressions and 150,000 reach has an average frequency of about 3.3 views per person.

• Is a higher reach always better?

  Not necessarily. Awareness campaigns generally want reach maximized, but conversion-focused campaigns often perform better with lower reach and higher frequency targeting people who've already shown intent.

• How is reach measured across a multi-platform campaign?

  Cross-platform reach requires deduplicating the same person across channels, which platforms estimate using device and identity matching, so it's typically an estimate rather than an exact count.

• How can a campaign increase reach without increasing budget?

  Capping frequency per user forces the remaining budget toward new, unexposed people instead of repeatedly serving ads to the same audience.