Newsletter Goal Timeline Calculator

📖 Overview

Newsletter growth is compounding and nonlinear.

This calculator projects timeline from current base growth rate and target size so planning is realistic.

Use it to set cadence goals and campaign checkpoints that match math.

Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.

Estimates months to target under compounding monthly growth assumptions.

The Formula

Months = log(Target/Current) ÷ log(1 + Monthly Growth Rate)

Current	Current subscriber/customer base
Target	Milestone goal size
Growth Rate	Net monthly growth percentage
log()	Compounding conversion from growth ratio to time

💡Small growth-rate improvements can significantly reduce timeline due to compounding.

Current→Target	3%/mo	6%/mo	10%/mo
2k→5k	~31 mo	~16 mo	~10 mo
5k→10k	~24 mo	~12 mo	~8 mo
10k→25k	~31 mo	~16 mo	~10 mo
20k→50k	~31 mo	~16 mo	~10 mo

Use this tool when you need a fast decision during active planning or execution.
Use this before committing money, time, or tradeoffs that are hard to reverse.
Use this to compare options using the same assumptions across scenarios.

Results can be misleading if key inputs are missing, stale, or unrealistic.
Very small or very large values may amplify rounding effects and interpretation risk.
If assumptions change mid-decision, recalculate before acting.

💡 Use conservative growth rates for planning.

💡 Re-run monthly with updated actuals to avoid stale projections.

💡 Model best/base/worst scenarios before committing launch timelines.

❓ What if growth rate is 0?

A larger target cannot be reached without positive growth.

❓ Does this include churn?

Only if your entered growth rate already reflects net growth after churn.