Impression Share Calculator
The share of available impressions your ads won, and what you lost.
Your numbers
Example values are prefilled. Use the same reporting period for all inputs.
Impression share
60%
Lost impression share
40%
The formula
Impression share = (Impressions ÷ Eligible impressions) × 100
Worked example
60,000 of 1,00,000 eligible = 60% impression share, 40% lost to budget or rank.