🛠️ Tool
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Free
Beginner
Reading about k-factor is one thing, measuring your own is another. This is a plug-in-your-numbers spreadsheet: enter your user base, invites sent, and signups from those invites, and it returns your actual K instead of a guess. Open the full spreadsheet if you want to edit the formulas and model a few scenarios yourself.
Virality (k-factor) Calculator and Spreadsheet
From Rows Free web tool
- Computes your real k-factor from three inputs you already have: total users, invites sent, and signups from invites.
- Because it is a spreadsheet you can copy, you can extend it to model cycle time or different conversion rates and see how growth compounds.
- Best used per cohort (invites divided by that cohort, signups divided by those invites) rather than across your whole base, which keeps the number honest.
