Viral Coefficient Calculator
Below 1 it amplifies acquisition rather than replacing it.
Viral coefficient
0.58
amplifies acquisition but does not replace it
Below 1, referrals amplify paid acquisition rather than replacing it — every customer you buy brings 2.27× customers in total. That effectively divides your acquisition cost by the same figure.
How the Viral Coefficient Calculator works
A coefficient at or above 1 means each customer brings at least one more and growth continues without further acquisition. Genuinely achieving that is rare and usually temporary — below 1, referrals multiply what you buy, which is still worth a great deal.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
What is the viral coefficient?
Invitations sent per customer times the rate at which invitations convert. A coefficient of 0.4 means every ten customers bring four more.
What does a coefficient below 1 give me?
A multiplier on paid acquisition. At 0.4, every bought customer brings about 1.67 in total, which effectively divides acquisition cost by the same figure.
Is above 1 realistic?
Briefly, for products with genuine network effects. Sustained coefficients above 1 are rare, and the ones reported are usually measured over a window that flatters them.
How do I raise it?
Either more invitations or better conversion on them. Invitation conversion usually has more headroom, since it depends on the offer and the friction of accepting rather than on asking more often.