K-Factor / Viral Coefficient
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
A metric that measures a product's self-propagation capability. K = (number of invitations sent per user) × (invitation conversion rate). If K > 1, the product will achieve exponential self-growth; if K < 1, growth will eventually stop.
SCAFFOLDING EFFECT
Reduce cognitive load
- Growth engine diagnosis: If users don't grow without advertising, it means K < 1. In this case, the focus should not be on buying traffic, but on optimizing the sharing mechanism (to increase invitations) or the landing page (to increase conversion rate).
Anchor fast decisions
A metric that measures a product's self-propagation capability: K = (invitations sent per user) × (invitation conversion rate). The mechanism is a **viral growth engine**—when K > 1, new users grow exponentially (without buying traffic); when K < 1, growth will eventually stop, requiring continuous paid acquisition.
MINIMUM ACTION
In progress 0/4Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/K-factorverified
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