To calculate your viral coefficient: First calculate the invitation rate, which is the number of invites sent divided by the number of users you have. Then calculate the acceptance rate, which is the number of signups or enrollments divided by the number of invites. Then multiply the two together. Table 17-1 shows sample math for a company with 2,000 customers who send 5,000 invitations, 500 of which are accepted. Table 17-1. Sample math for a viral coefficient calculation Existing customers 2,000 Total invitations sent 5,000 Invitation rate 2.5 Number that get clicked 500 Acceptance rate
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