Viral Coefficient (k-factor) Calculator

Use our free Viral Coefficient (k-factor) calculator to determine your product's viral growth rate. Find out if your product has achieved true viral growth, which means it has a viral coefficient greater than 1.

Viral Coefficient (k-factor) Calculator

How to Use This Calculator

Follow these simple steps to calculate your product's viral growth metrics:

Step 1: Enter your current total number of active users
Step 2: Input the total number of invites sent by all users
Step 3: Add the number of new signups that came from these invites

The calculator will automatically compute your viral metrics, including invites per user, conversion rate, and viral coefficient (k-factor).

How to Calculate Viral Coefficient (k-factor)

You can calculate the viral coefficient by taking the total number of active users, multiplying it by the average number of invites sent per user, multiplying that by the average conversion rate of invites, and dividing the result by 100.

Why Viral Coefficient (k-factor) Matters and How to Interpret It

A viral coefficient above 1 means your product has exponential growth, as each user brings in more than one new user.

A coefficient of exactly 1 means stable growth, where each user brings in one new user.

A coefficient below 1 indicates declining growth, as each user brings in less than one new user and acquisition depends on non-viral channels.

Viral Coefficient (k-factor) Calculator