What are impressions in advertising?
What counts as an impression?
One showing of the ad. If the same person sees it three times, that is three impressions. A shown ad is not the same as a seen ad.
Each platform documents its own definition. Read both before you compare impressions across platforms.
Why do impressions matter?
They sit under most ad metrics, including these two. CPM is the cost of one thousand impressions: cost divided by impressions, times one thousand. CTR is clicks divided by impressions, usually as a percentage.
But impressions measure delivery, not effect. A large number is easy to buy and easy to show in a report. It can tell you your money was spent. It cannot tell you it did anything.
There is a harder question too. When someone sees an ad, does not click and buys later, does the ad deserve credit? That is the argument around a view-through conversion: a conversion credited to an ad the person saw but did not click, within a set window.
For ZFD: Impressions are a count, not a result, so we use them to explain cost, not to claim success.
For where they fit in channel choice, see our paid media strategy for ecommerce.
Worked example
Easily confused with
Impressions vs Reach
The number of people who saw your ads at least once. On Meta it is an estimate. Impressions can include the same person many times.
Impressions vs Frequency
The average number of times each person saw your ad: impressions divided by reach.
Impressions vs Clicks
An action by a person. An impression is only a showing.
FAQ
Are impressions the same as views?
No. An impression is a showing of the ad. Someone may never have looked at it.
Are impressions the same as reach?
No. Reach counts people. Impressions count showings, and one person can account for many.
Do more impressions mean more sales?
Not by themselves. More showings cost more. Whether they lead to orders is a separate question.
Sources
- Impressions: Definition - Google Ads HelpPrimary source
Let’s find what’s actually working.
Next step. Check what your ad numbers mean for profit. Use the Is your ROAS real? calculator.