Calculator · 100% free, no signup · Updated May 2026
When will you hit 10k / 50k / 100k subscribers?
A free newsletter growth runway calculator that projects months-to-milestone (10k / 50k / 100k subscribers) based on current size, weekly net-new, and monthly churn. Outputs the required net-new per week to compress the timeline + channel-mix recommendations.
Enter current subscriber count + weekly net-new subscribers + monthly churn rate. The calculator projects months to hit common milestones (10k / 50k / 100k) and surfaces which growth channels need to scale to compress the timeline.
Your newsletter
Milestone runway
- 5,000 subs14 months · ETA Jul 2027
- 10,000 subs38 months · ETA Jul 2029
- 25,000 subsUnreachable at current rate (churn ≥ net-new)
- 50,000 subsUnreachable at current rate (churn ≥ net-new)
- 100,000 subsUnreachable at current rate (churn ≥ net-new)
To hit 5,000 subs in 12 months
78 subs / week net-new required (you're at 75)
Gap: +3/week. Add cross-promotion swaps (3-5 swaps/month) and a referral mechanic to close it.
Who this is for
Substack, Beehiiv, and ConvertKit operators who keep checking their dashboard and want to know when the milestone math actually closes.
The problem this solves
Newsletter growth math is unintuitive: 1,200 subscribers growing at 50/week feels slow, but compound math says it's 17 months to 10k. The calculator runs the actual math + churn so operators stop fooling themselves about the timeline.
The median newsletter takes 24-36 months to reach 10,000 active subscribers — yet 78% of newsletter operators expect to hit that milestone within 12 months and quit when reality diverges.
Source: Beehiiv State of Newsletters 2024 + Substack Discovery Report 2024
How to use it
- 01
Current subscribers
Your active subscriber count today.
- 02
Weekly net-new
New subs minus unsubs per week (use last 4-week average).
- 03
Monthly churn rate
Default 1.5%; high-quality newsletters: 0.8%; low-engagement: 3%+.
- 04
See the runway
Months to 10k / 50k / 100k + channel-mix shifts to compress timeline.
What you get
- ✓ Months to each milestone (10k / 50k / 100k)
- ✓ Compound-growth projection chart
- ✓ Channel-mix recommendations
- ✓ Required net-new to hit milestone by target date
Frequently asked
How many newsletter subscribers can I realistically gain per week?
Solo operator with no paid acquisition: 10-50/week organic. With consistent cross-promotion + lead magnets: 50-200/week. With paid + referrals: 200-1000/week. Anything above requires a content/audience flywheel.
What's a healthy churn rate?
Under 1% monthly is excellent (B2B-aligned newsletters). 1-2% is healthy (consumer/lifestyle). Over 3% is concerning — likely a quality issue or list-hygiene problem. The calculator defaults to 1.5%.
How do I 10× my net-new subscribers?
Three highest-leverage moves: (1) cross-promotion swaps with newsletters in adjacent niches, (2) referral programs (Beehiiv's native or SparkLoop), (3) lead magnets gated behind email opt-in. Paid acquisition is fourth — typically lower ROI.
Should I worry about open-rate dropping over time?
Open rate naturally drops 5-15% as your list grows because casual subscribers dilute the engaged core. Focus on net-new × engaged-core size, not open rate. The calculator models active subscribers, not list size.
When does paid acquisition make sense for newsletters?
When LTV (open rate × monetization per subscriber × tenure) exceeds CAC by 3×. Most newsletters monetize at $0.30-$3/subscriber/year, so CAC has to be sub-$1 for paid to work. Sponsorships and paid tiers shift the math.
Related tools
Author + maintainer
Adrian Berisha — Founder of Clipflow. Indie SaaS builder shipping creator tools full-time since 2024. All tools and benchmarks on this page are reviewed quarterly. Last review: May 2026.
@clipflow on X · LinkedIn · hi@clipflow.to
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