Calculator inputs
Formula used
Reach per post = Audience size × (Reach rate ÷ 100)
Organic impressions = Reach per post × Number of posts × Average frequency
Gross impressions = Organic impressions + Paid impressions
Net impressions = Gross impressions × (1 − Overlap rate ÷ 100)
Viewable impressions = Net impressions × (Viewability rate ÷ 100)
Estimated spend = (Net impressions ÷ 1000) × CPM
This model gives planning estimates. Real platform totals can differ because each network measures impressions differently.
How to use this calculator
- Enter your total audience size or follower base.
- Add the expected reach rate for each post.
- Enter the number of campaign posts.
- Set average frequency for repeated exposure.
- Add paid impressions from ads or boosts.
- Apply overlap rate to remove duplicate audience exposure.
- Enter viewability rate for visible impression estimates.
- Add CPM if you want a spend estimate.
- Click calculate to show results above the form.
- Use CSV or PDF buttons to export the results.
Example data table
| Audience Size | Reach Rate | Posts | Frequency | Paid Impressions | Overlap Rate | Viewability | CPM | Days | Organic Impressions | Gross Impressions | Net Impressions | Viewable Impressions | Avg Daily | Estimated Spend |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50,000 | 28% | 12 | 1.9 | 45,000 | 15% | 72% | $6.50 | 30 | 319,200.00 | 364,200.00 | 309,570.00 | 222,890.40 | 10,319.00 | $2,012.21 |
Frequently asked questions
1. What does impression volume mean?
Impression volume is the estimated number of times content appears on screens. One user can generate multiple impressions when they see the same post more than once.
2. Why are gross and net impressions different?
Gross impressions include all counted exposures. Net impressions reduce duplicates using the overlap rate. This helps you estimate unique delivery more realistically during planning.
3. What is a good reach rate?
A good reach rate depends on platform, audience size, content quality, and timing. Smaller accounts often see higher organic reach percentages than large accounts.
4. Why use viewability in this calculation?
Viewability helps separate delivered impressions from impressions likely seen on screen. This makes performance planning more useful when comparing channels or creative formats.
5. Does this calculator work for paid campaigns?
Yes. You can enter paid impressions directly and combine them with organic estimates. The CPM input also helps estimate spend from projected delivery volume.
6. Can one person generate many impressions?
Yes. Impressions count exposures, not people. If one person sees your post several times, each view can add another impression to the total.
7. Are platform-reported impressions always identical?
No. Platforms use different counting rules, delivery windows, and reporting delays. This tool is best for campaign planning, forecasting, and scenario comparison.
8. When should I export CSV or PDF?
Export when sharing projections with clients, teams, or managers. CSV works well for spreadsheets, while PDF is useful for quick reporting and documentation.