Viral Coefficient (k-factor)

Average new users acquired per existing user via sharing

Product Marketing SaaS / Software Media / AdvertisingRatioWeekly

FORMULA

k-factor = Invitations per User × Invitation Conversion Rate

What is Viral Coefficient?

Viral Coefficient (k-factor) measures how many new users an existing user brings through referrals and sharing. k-factor > 1.0 = exponential growth; < 1.0 = linear growth. Products like Facebook achieved k > 0.5, enabling rapid growth.

Chart

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Sample Data

week	invitationsPer	conversionRate	kFactor
Week 1	2	0.25	0.5
Week 2	2.2	0.27	0.59
Week 3	2.5	0.3	0.75
Week 4	2.8	0.32	0.9

Required Data Columns

Invitations SentConversions