Mis on viiruskoefitsient (K-faktor)?

Viral coefficient (K-factor) is a metric that shows how effectively a product spreads through user recommendations. It reflects the average number of new users attracted by one existing user.

Formula:

K-factor = (number of invitations per user) × (conversion rate of invitations to new users)

If the K-factor is greater than 1, the product grows exponentially due to the viral effect. If it is less than 1, growth slows down and additional marketing efforts are needed.

Example: if each user invites an average of 5 people, and 20% of them register, then K-factor = 5 × 0.2 = 1.0 — the product grows steadily due to viral spread.