Substack Notes Growth-to-Subscriber Conversion Calculator

Estimate how your Substack Notes growth converts into new email subscribers, paid subscribers, and net monthly revenue after Substack and Stripe fees.

Mathematical Audit

Substack Notes Growth-to-Subscriber Conversion Formula

Substack Notes acts as a discovery feed: impressions on your Notes turn into followers, a portion of followers convert to free email subscribers, and a small share of those subscribers convert to paid. Substack takes a 10% platform fee plus Stripe processing fees (2.9% + $0.30) on paid subscriptions.

New Followers = Monthly Notes Impressions × Impression-to-Follow Rate
New Free Subscribers = New Followers × Follow-to-Subscribe Rate
New Paid Subscribers = New Free Subscribers × Free-to-Paid Conversion Rate
Gross Monthly Revenue = New Paid Subscribers × Monthly Subscription Price
Substack Platform Fee = Gross Monthly Revenue × 10%
Stripe Processing Fee = (Gross Monthly Revenue × 2.9%) + (New Paid Subscribers × $0.30)
Net Monthly Revenue Added = Gross Monthly Revenue − Substack Platform Fee − Stripe Processing Fee
Annual Value of New Subscribers = Net Monthly Revenue Added × 12

Real-world Substack free-to-paid conversion rates average around 3%, well below Substack's often-cited 5-10% benchmark. Follower-to-subscriber conversion from Notes also tends to be lower quality than direct subscribers, since many readers click 'Follow' without intending to subscribe.

Operational Guide

How to Use the Substack Notes Subscriber Conversion Calculator

1

Enter your monthly Notes impressions

Input the total number of views your Notes receive across Substack's Notes feed each month.

2

Enter your impression-to-follow rate

Input the percentage of people who see your Notes and click 'Follow' on your publication.

3

Enter your follow-to-subscribe rate

Input the percentage of new followers who convert into free email subscribers.

4

Enter your free-to-paid conversion rate and subscription price

Input the percentage of free subscribers who upgrade to paid, and your monthly subscription price.

5

Review your conversion funnel and revenue

See your projected new followers, free subscribers, paid subscribers, and net monthly and annual revenue after fees.

Real-World Scenario Example

"A writer gets 50,000 Notes impressions per month, with a 1% follow rate, 15% follow-to-subscribe rate, 3% free-to-paid rate, and an $8/month subscription."

Inputs

monthlyNoteImpressions:50000
impressionToFollowRate:1
followToSubscribeRate:15
freeToPaidRate:3
monthlySubscriptionPrice:8

Result

New Followers: 500. New Free Subscribers: 75. New Paid Subscribers: 2.25. Gross Monthly Revenue: $18.00. Substack Platform Fee: $1.80. Stripe Processing Fee: $1.20. Net Monthly Revenue Added: $15.00. Annual Value of New Subscribers: $180.04.

Important Disclaimer

These estimates are pre-tax and for educational purposes only. Actual conversion rates vary widely based on niche, content quality, audience source, and engagement. Substack and Stripe fee structures are subject to change.

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