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---
title: "K-Factor"
type: concept
tags: ["viral", "metrics", "growth", "referral"]
last_updated: 2026-04-26
---
## Definition
病毒系数K-factor——衡量有机传播效率的指标。K = 邀请率(每个用户平均发送邀请数)× 接受率每个邀请的平均接受转化率。K > 1.0 意味着每个用户平均能带来超过一个新增用户实现指数级自然增长K < 1.0 则增长需要依赖外部获客渠道。
## Formula
```
K-factor = 邀请率 × 接受率
= (发送邀请数 / 总用户数) × (接受邀请数 / 发送邀请数)
```
## Interpretation
| K-factor | Growth Pattern |
|----------|---------------|
| K > 1.0 | 指数级自然增长(病毒式传播)|
| K = 1.0 | 线性增长(每位用户带来一位新用户)|
| K < 1.0 | 需要外部获客渠道补充 |
## Source
- [[marketing-growth-hacker]]Marketing Growth Hacker Agent
## Aliases
- Viral Coefficient