Facebook Ad Reach Calculator
Estimate the unique reach of your Facebook campaign. Enter your budget, CPM, and target frequency to see total impressions and how many distinct people you'll reach.
Free · No signup · Updated June 2026
Your numbers
Avg. times each person sees the ad
Results
Estimates for planning only. Your real results depend on audience, creative, and market conditions.
What it measures
Facebook ad reach is the number of unique people who see your ad, calculated from total impressions and how often each person sees it.
Formula
Impressions = Budget ÷ CPM × 1,000 · Reach = Impressions ÷ Frequency
Worked example
A $2,000 budget at an $11 CPM generates about 181,818 impressions, and at a frequency of 2 that reaches roughly 90,909 unique people.
Typical benchmarks
- Prospecting frequency
- 1-2
- Retargeting frequency
- 3-5
- Fatigue threshold
- 5-7+
How this calculator works
Impressions = budget ÷ CPM × 1,000. Reach = impressions ÷ frequency, where frequency is the average number of times each person sees your ad. Lowering frequency stretches your budget across more people.
Frequently asked questions
What's a good ad frequency? +
For cold prospecting, keep frequency around 1–2 to maximize reach. For retargeting, 3–5 is fine. Above 5–7 you risk ad fatigue.
Is reach the same as impressions? +
No. Impressions count every time your ad is shown; reach counts unique people. If 1,000 people each see your ad twice, that's 2,000 impressions and 1,000 reach.
How can I increase reach without spending more? +
Lower your CPM by broadening targeting and improving ad relevance, and keep frequency low so each impression hits a new person rather than repeating to the same audience.
What is the difference between reach and frequency? +
Reach is how many unique people saw your ad; frequency is the average number of times each of those people saw it. Impressions equal reach multiplied by frequency.
Is a higher reach always better? +
Not for conversion campaigns. Broad reach suits awareness goals, but for sales a smaller, high-intent audience seen a few times often outperforms maximum reach.
Need a custom Facebook tool, not a generic calculator?
This free facebook ad reach 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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