Reach Calculator
Reach: Reach = impressions ÷ average frequency. Methodology stated, your own inputs only.
In short
Reach: Reach = impressions ÷ average frequency. Methodology stated, your own inputs only.
Formula: Reach = impressions ÷ average frequency.
What this calculator does
Reach: Reach = impressions ÷ average frequency. Methodology stated, your own inputs only. Worked example, questions and limitations included.
Use it to turn Impressions, Average frequency (impressions per person) into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this marketing calculation.
Inputs and what they mean
- Impressions
- — number value.
- Average frequency (impressions per person)
- — number value.
How to use it
- Enter each value in the unit shown next to the box (use the unit converter first if your numbers are in other units).
- Check the breakdown to see every intermediate step.
- Read the limitations before relying on the result.
Formula
Methodology: IAB relationship impressions = reach × frequency, rearranged.
Platforms measure reach directly with de-duplication; use theirs if available.
Cross-platform reach cannot be summed without overlap data.
Reach = impressions ÷ average frequency.
Inputs used: Impressions, Average frequency (impressions per person).
Worked example
A social campaign
- 900,000 ÷ 3 = 300,000 people.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Average-based estimate.
- No cross-platform de-duplication.
- Results are educational estimates built only from the figures you enter. They are not personalised investment, tax, legal or accounting advice. Rates, growth and discount assumptions are always yours to choose.
- The result depends on the values you enter for this reach calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Reference: IAB
Last reviewed:
Common questions
Can I add reach across platforms?
No — the same person may be on both. You'd double-count.
Reach vs impressions?
Reach is unique people; impressions count every showing. Check the formula, example, and limitations on this page before using the result for a real marketing decision.
What is a good value?
It depends on channel, audience and industry. We don't assume a benchmark — compare against your own campaigns.
How do I use the Reach Calculator?
Enter the required values for Impressions, Average frequency (impressions per person). The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Reach Calculator use?
Reach = impressions ÷ average frequency. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the Reach Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Sources
Method based on IAB.
Cite this page
Free Calculator. (2026, October 15). Reach Calculator. https://freecalculator.tech/tools/reach-calculator
"Reach Calculator." Free Calculator, 15 Oct. 2026, https://freecalculator.tech/tools/reach-calculator.
Reach Calculator — Free Calculator, https://freecalculator.tech/tools/reach-calculator
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ROAS: ROAS = attributed revenue ÷ ad spend. Methodology stated, your own inputs only.
Campaign Break-Even: Break-even ROAS = 1 ÷ gross margin. Methodology stated, your own inputs only.