Paid Media Guide
How to Calculate Reach & Frequency in Advertising
Reach, impressions and frequency describe how advertising exposure is distributed across an audience. This guide covers the standard frequency formula, how to calculate reach, the reach × frequency relationship, practical examples and repeated exposure.
Try our Reach & Frequency Calculator →Reach, impressions and frequency
Impressions count total advertising exposures. Reach estimates the unique people or entities exposed at least once. Frequency describes the average number of impressions delivered per person reached.
How many people or entities received at least one impression.
How many impressions were delivered per person reached on average.
How to calculate ad frequency
How to calculate reach from impressions
Reach × frequency = impressions
Reach and frequency worked examples
3.0 frequency
600,000 impressions
300,000 reach
Is a high advertising frequency bad?
Not automatically. The appropriate level depends on objective, audience size, creative variety, buying platform and campaign duration.
Review repeated exposure with CTR, CPA, ROAS, creative age and audience saturation.
Why platform-reported reach can differ
Platforms can estimate unique reach using different identity, deduplication and modelling methods. Calculated reach is the mathematical relationship between the values you provide, not a replacement for a platform's own reach methodology.
Reach is sensitive to date range because people exposed on multiple days may be deduplicated within the selected period.
Using reach and frequency in media planning
- Estimate desired reach. Define the scale of unique exposure.
- Choose a frequency assumption. Set planned average repetition.
- Calculate impressions. Reach × frequency gives required delivery.
- Apply a CPM assumption. Translate impressions into media cost.
- Monitor actual delivery. Compare plan with platform results.
Use the CPM Calculator to convert planned impressions and CPM into estimated media spend.
Reach and frequency FAQs
How do you calculate frequency?
Impressions ÷ reach.
How do you calculate reach?
Impressions ÷ frequency.
How do you calculate impressions?
Reach × frequency.
Is reach the same as impressions?
No. Reach estimates unique exposure; impressions count all exposures.
Calculate reach, frequency or impressions
Enter any two values and PaidMediaKit calculates the missing metric.
Open Reach & Frequency Calculator →