What affects Impression Share?

Impression Share is influenced by advertising budget, bid strategy, ad quality, audience targeting, and competition for the same keywords.

Is a higher Impression Share always better?

Not necessarily. While a higher Impression Share increases visibility, pursuing 100% coverage may result in higher costs without proportional returns if targeting is not optimized.

Why does Impression Share matter in PPC campaigns?

Impression Share helps advertisers understand how much available ad inventory they are capturing and whether competitors are gaining visibility in the same auctions.

Can I ever get 100% Impression Share?

Yes, but it is uncommon and often expensive. Most successful campaigns maintain a healthy Impression Share between 70% and 90% while balancing efficiency and cost.

Impression Share (IS): Formula, Calculation & PPC Benchmarks

What is Impression Share (IS)

Impression Share (IS) measures the percentage of times your ads were shown out of the total number of times they were eligible to appear. It’s a key metric in digital advertising (Google Ads, Bing Ads, etc.) that reflects your visibility compared to competitors bidding for the same audience.

How to Calculate Impression Share

Track your impressions. This is the number of times your ads actually appeared to users.
Check total eligible impressions. This is the total number of times your ads could have been shown, based on targeting, budget, and bidding.
Divide impressions by eligible impressions. This gives you the portion of the ad space you captured.
Multiply by 100. Express the result as a percentage.

Formula

Impression Share = (Your Impressions ÷ Total Eligible Impressions) × 100

Benchmark

Strong campaigns often see 60% – 90% Impression Share, though the range varies across industries and competition levels.
A low IS usually means budget or bid constraints are limiting ad visibility.

FAQ's

Budget, ad quality, targeting settings, and competition for the same keywords all influence IS.

Not always. A 100% IS means maximum coverage, but it could also mean overspending if the audience size isn’t well targeted.

It helps advertisers understand how much of the potential ad space they are capturing and whether they are losing ground to competitors.

Yes, but it’s rare and expensive. It means your ad showed in every possible eligible auction. Usually, 70–90% is considered healthy and cost-efficient.

Impression Share (IS)