Viral Coefficient Calculator

Calculate your product's K-factor and predict viral growth potential. See if your referral program can achieve exponential growth.

Your Metrics

Current Users

How many users do you have now?

Invitations Sent Per User

Average invites each user sends

Conversion Rate (%)

% of invited users who sign up

Your Results

Enter your metrics and click Calculate

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What is Viral Coefficient (K-Factor)?

The viral coefficient, or K-factor, measures how many new users each existing user brings to your product through referrals. It's calculated as: K = (Invitations per User) × (Conversion Rate)

Understanding Your K-Factor

K > 1: Exponential viral growth - your product spreads itself!
K = 0.5 to 1: Moderate growth - you're on the right track
K < 0.5: Slow growth - focus on improving referral mechanics

How to Improve Your Viral Coefficient

There are two main levers to increase your K-factor:

Increase invitations sent: Make sharing easy, incentivize referrals, gamify the process
Improve conversion rate: Optimize landing pages, add social proof, reduce friction