Growth maths · Free
Viral K-Factor Calculator
Is your referral loop actually viral?
K-factor
0.30
Below 1 — referrals boost, don't compound
Users after 8 loops
1,429
Day 56
Long-run total from referrals
1,429
From the starting users alone
| Loop | Day | New users | Total users |
|---|---|---|---|
| 1 | 7 | 300 | 1,300 |
| 2 | 14 | 90 | 1,390 |
| 3 | 21 | 27 | 1,417 |
| 4 | 28 | 8 | 1,425 |
| 5 | 35 | 2 | 1,428 |
| 6 | 42 | 1 | 1,428 |
| 7 | 49 | 0 | 1,428 |
| 8 | 56 | 0 | 1,429 |
How to use it
- Enter invites sent per user, the share of invites that sign up and how long one loop takes.
- Watch the growth table: K above 1 compounds, below 1 fades out.
What good looks like
- K above 1 is true virality (rare); 0.2–0.5 is a healthy boost to paid growth.
- Shorter cycle times matter as much as K.
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