K-Factor Calculator

Measure the virality of your product.

Your calculation result will show up here.

Your product's K-factor is:

What is a product’s K-factor?

K-factor estimates how many new users each existing user brings through invitations. It combines invitation volume with the fraction of invitations that convert.

How to use this tool

K = invites per user × invite conversion rate. Enter conversion as a decimal, such as 0.20 for 20%. This tool displays K as a percentage: 100% corresponds to K = 1.

Example

Five invitations per user with a 20% conversion rate gives K = 1, displayed as 100%. Three invitations at the same rate gives K = 0.6, displayed as 60%.

Understanding your result

K above one describes potential referral growth under unchanged assumptions. It does not account for user churn, repeated invitations, overlapping audiences, or how long an invitation cycle takes.

Related tools: Retention Rate Calculator · Stickiness Calculator.

Embed this calculator

Put this calculator on your website to increase visitor engagement and get more social shares!

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