- Set initial reach
Enter the first audience exposed to the content.
- Estimate share rate
Use the percentage of reached users likely to share.
- Estimate sharer audience
Enter the average number of people exposed by each sharer.
- Choose generations
Select how many successive sharing rounds to model.
- Compare reach
Review cumulative reach, incremental reach, and total modeled shares.
Viral Reach Calculator
The Viral Reach Calculator models how content might spread when a portion of each audience shares it with another audience. It estimates cumulative reach across several sharing generations rather than treating the first wave of impressions as the final result.
This is a scenario model, not a prediction guarantee. Audience overlap, platform ranking, repeated exposure, private sharing, and declining interest can make real reach materially lower or higher.
Calculator inputs
people
%
people
rounds
Result
—
Estimated cumulative reach
Initial reach—
Additional reach—
Estimated shares—
Next-generation reach = Current reach × Share rate × Average audience per sharer
Cumulative reach = Initial reach + Sum of all modeled generations
What the result means
The large result illustrates how sensitive viral models are to share rate and audience assumptions.
Results are estimates based on the values and assumptions entered.
Given: 10,000 initial reach, 3% share rate, 250 people per sharer, and 3 generations.
Calculation: Round 1: 10,000 × 0.03 × 250 = 75,000. Round 2: 75,000 × 0.03 × 250 = 562,500. Round 3: 4,218,750.
Result: 4,866,250 cumulative modeled reach.
The large result illustrates how sensitive viral models are to share rate and audience assumptions.
Why can the estimate become very large?
Compounding across generations makes the result highly sensitive to the share rate and audience size.
Does it remove duplicate viewers?
No. Audience overlap is not deducted.
What is a sharing generation?
It is one successive wave in which the newly reached audience produces another set of shares.
Should I use follower count as audience per sharer?
Usually not. Use expected exposure per share, which may be much lower than follower count.
Is this a forecast?
It is a scenario estimate, not a guaranteed platform outcome.