Newsletter Growth Calculator
Project newsletter subscriber growth and revenue potential using compound monthly growth and churn rates.
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How to use this calculator
Each month's subscriber count compounds the previous month by adding growth rate and subtracting churn rate. Monthly revenue = final subscribers × average revenue per subscriber. Annual revenue = monthly revenue × 12.
- 1
Enter your current subscriber count and your average monthly growth rate (new subscribers / total subscribers × 100).
- 2
Add your monthly churn rate (unsubscribes + bounces / total subscribers × 100) — typically 1–3% for healthy lists.
- 3
Enter average revenue per subscriber per month from paid subscriptions, sponsorships, or affiliate revenue.
- 4
Adjust the projection period to model 6-month, 12-month, or 24-month growth scenarios.
Frequently asked questions
What is a healthy newsletter churn rate?
Monthly churn rates of 1–2% are typical for engaged newsletters. Above 3% suggests content-audience mismatch or too-frequent sending. Churn below 1% indicates an extremely engaged, loyal audience. Always monitor unsubscribes after each send to catch issues early.
How do newsletters generate revenue?
The four main monetisation models are: paid subscriptions (Substack), sponsorships and native ads, affiliate marketing (commissions on product recommendations), and using the list to sell your own products or services. Sponsorship CPMs range from $20 to $60+ for niche audiences.
What is a realistic monthly newsletter growth rate?
Organic-only growth of 2–5% per month is achievable for most niches. Aggressive paid acquisition or viral referral programmes (like Sparkloop) can push growth to 10–20%/month. Above 20% is exceptional and usually unsustainable without continuous paid spend.
How do I increase revenue per subscriber?
Segment your list to send more targeted offers, add a paid tier with exclusive content, negotiate higher sponsorship rates as your audience grows, and test higher-ticket products or course upsells. Newsletters with CPMs above $40 typically serve a specific professional niche.
Newsletter Growth Calculator — Subscriber & Revenue Projections
The Power of Compound Newsletter Growth
At 5% monthly growth and 2% churn, a newsletter of 2,500 subscribers compounds to nearly 4,500 in 12 months — a 77% increase with no additional effort beyond maintaining the growth rate. The compound effect works in both directions: high churn (5%+) rapidly erodes a list even with strong new subscriber acquisition. Monitoring net growth rate (growth minus churn) is more important than tracking raw subscriber adds.
Building a Revenue Model for Your Newsletter
Average revenue per subscriber varies enormously by monetisation model. A $10/month paid Substack with 50% paid conversion rate delivers $5 ARPS. A free newsletter with $40 CPM sponsorship sending 4 times per month to 10,000 subscribers earns $1.60 ARPS. Combining a free tier with a paid upgrade is the highest-revenue model for most newsletter operators, with top creators achieving $5–$15+ ARPS on large audiences.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →