Substack Growth Calculator
Enter your current subscribers and an estimated monthly growth rate to see where you'd land over time, assuming that rate holds. Free, no signup.
Plan your growth
| Month | Subscribers |
|---|---|
| 1 | 550 |
| 2 | 605 |
| 3 | 666 |
| 4 | 732 |
| 5 | 805 |
| 6 | 886 |
| 7 | 974 |
| 8 | 1,072 |
| 9 | 1,179 |
| 10 | 1,297 |
| 11 | 1,427 |
| 12 | 1,569 |
Assumes a constant monthly growth rate compounding each month - a simplified model, not a guarantee. Real growth is uneven and depends on posting consistency and what you publish.
How this Substack growth projection is calculated
This calculator uses compound monthly growth - the same math as compound interest. Each month's subscriber count is your current count multiplied by (1 + growth rate), and next month compounds on top of that new total rather than the original number. That's why even a modest monthly rate produces a noticeably larger number after a year than simply multiplying by 12.
It's a projection, not a forecast: it assumes your growth rate stays constant, which real Substack growth rarely does. Growth tends to come in bursts (a strong recommendation, a viral Note) followed by flatter stretches, so treat the output as a planning reference rather than a guarantee.
Questions
How is Substack subscriber growth actually calculated here?
Compound monthly growth: each month's subscriber total is the previous month's total multiplied by (1 + your growth rate), the same formula used for compound interest.
What's a realistic monthly growth rate to use?
It varies enormously by niche, audience size, and how active you are with recommendations - there's no single realistic number. Try your own account's actual month-over-month rate from the last few months instead of guessing.
Why does the subscriber count grow faster in later months?
Because growth compounds - each month's gain is calculated on the new, larger total, not the original starting number. This is identical to how compound interest accelerates over time.
Can I track my real growth rate instead of estimating it?
Yes - NotesIQ reads your subscriber count directly from your public profile and tracks it over time automatically, since Substack's own dashboard doesn't show that history.