Understanding Ad Frequency
How we calculate. Frequency = impressions ÷ unique reach. See our methodology and accuracy policy .
Real-world scenario: A typical Ad Frequency case uses impressions 1200000 and reach (unique people) 300000. Enter the same figures below to reproduce the worked path.
What is Ad Frequency?
A brand-safety and fatigue metric. Very high frequency can waste spend and annoy audiences.
- Reach must be unique people
- Platform reach models differ
- Cap frequency on awareness flights
The Formula
Worked Example
Common Use Cases
- Media plans: fatigue checks
- Retargeting: avoid overexposure
- Brand studies: effective frequency
Pro Tips
- Pair with CTR decay as frequency rises
- Refresh creative when fatigue shows
- Don’t chase reach with spammy frequency
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: Ad Frequency results are educational marketing planning aids—not guarantees of campaign performance. Platform definitions and attribution models vary.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
The worked example for ad frequency was verified with the calculator form on this page—enter the same values to confirm the result.
When to use this calculator
- Use this page when your wording matches ad frequency and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about ad frequency? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this ad frequency calculator?
For ad frequency, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for ad frequency—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking ad frequency, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For advertising and analytics definitions, consult:
- Google Ads Help — CPC, CPM, conversion, and ROAS concepts
- IAB — digital advertising standards
- Google Analytics Help — conversion and engagement metrics