calculator
Free Viral Coefficient (K-Factor) Calculator
Calculate your product's viral K-factor and project organic-only user growth from a seed cohort. Models invitation funnel (sent → opened → clicked → activated), cycle time per generation, and compounding through 12 generations. Identifies whether you have a true viral loop (K > 1) or a leaky bucket. Includes lever analysis: which input would most efficiently push K above 1.
Inputs
Results
Viral K-Factor
0
Funnel Conversion (Invite → Activated Inviter)
2.9%
Total Users After Projection
1,130
New Users in Final Generation
0
Total Elapsed Days
60
Viral Multiplier per Week
1
K if Invitations Sent +50%
0
K if Activation Rate +50%
0
K if Sign-up Rate +50%
0
Biggest Lever Improves K By
0
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About the Author
David Shadrake
David Shadrake works on strategic business development and tech partnerships, with focus areas across AI, fintech, venture capital, growth, sales, SEO, blockchain, and broader tech innovation. Read more of his perspective on partnerships, market dynamics, and emerging technology at davidshadrake.com.