Google Ads Impression Share Calculator
Calculate how many impressions you're missing. Enter your impressions and impression share to see total available impressions and the gap.
Free · No signup · Updated June 2026
Your numbers
Results
Estimates for planning only. Your real results depend on audience, creative, and market conditions.
What it measures
Google Ads impression share is the percentage of total available impressions your ads actually received, and the gap reveals how many impressions you're missing.
Formula
Total available = Your impressions ÷ (Impression share ÷ 100) · Missed = Total − Yours
Worked example
With 40,000 impressions at a 65% impression share, about 61,538 impressions were available, meaning roughly 21,538 were missed.
Typical benchmarks
- Strong impression share
- 70%+
- Lost IS (budget)
- Raise budget
- Lost IS (rank)
- Raise bid / QS
How this calculator works
Total available = your impressions ÷ (impression share ÷ 100). Missed impressions = total − yours. Lost impression share comes from budget limits and ad rank — addressing both unlocks the gap.
Frequently asked questions
What is impression share? +
It's the percentage of total available impressions your ads actually received. 65% means you missed 35% of opportunities to show.
How do I increase impression share? +
Raise budgets (for lost IS due to budget) and improve bids and Quality Score (for lost IS due to rank).
What is a good impression share? +
For high-priority branded or core terms, aim for 80%+. For broad non-brand keywords, 50-70% is often acceptable depending on budget and profitability.
What is the difference between lost IS budget and lost IS rank? +
Lost IS (budget) means you ran out of money to show; lost IS (rank) means your Ad Rank was too low. Fix the first with budget, the second with bids or Quality Score.
Is 100% impression share worth chasing? +
Rarely. Pushing to 100% often means overbidding on low-value queries; the last few points of impression share are usually the least profitable.
Need a custom Google Ads tool, not a generic calculator?
This free google ads impression share calculator gets you a number. If you want it wired to your live ad data, GlitchFi builds custom marketing calculators, dashboards, and internal tools, plus full MVPs, with a forward-deployed engineer on your team. Fixed price, 30 days, and you pay nothing if we're late. You own all the code.
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