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Substack Newsletter Gross Revenue Retention Calculator
Free gross revenue retention calculator built for Substack Newsletter founders: plug in your numbers, get instant 2026 benchmarks, and export a Markdown report.
Interactive Studio
Step 1 · Configure Inputs
Your Metrics & Parameters
Adjust values or drag sliders — outputs recalculate live.
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Engine Methodology
Gross Revenue Retention Calculator: LTV = (ARPU × GrossMargin%) ÷ MonthlyChurn% · LTV:CAC = LTV ÷ CAC · Payback = CAC ÷ MonthlyGrossContribution
Top-Quartile Benchmark
LTV:CAC Ratio & Payback
4.03x LTV:CAC
Each customer generates $2,541 in gross-margin LTV over an average 45.5-month lifespan, yielding a 4.03:1 LTV:CAC ratio and 11.3-month CAC payback.
Customer Lifetime Value (LTV)
$2,541
45.5 mo avg tenure
LTV : CAC Ratio
4.03 : 1
Target >= 3.0 : 1
CAC Payback Period
11.3 mos
Target <= 12 months
Monthly Gross Contribution
$55.90
86% gross margin on $65.00 ARPU
Next Step for Founders
Launch on FoundrList ($29) or submit to 100 directories ($279)
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Used by 1,240+ SaaS & AI founders for organic traffic and AI citations.
2026 Reference Data
Industry benchmarks. How your product analytics, funnel & pmf metrics compare.
| Benchmark Metric | 2026 Standard | Founder Context |
|---|---|---|
| Sean Ellis PMF Threshold | ≥ 40% 'Very Disappointed' | Leading indicator of sustainable retention and organic word-of-mouth. |
| Annual Prepay Plan Adoption | 20% – 35% of customers | 2 months free (~16.7% discount) maximizes upfront cash flow. |
| Effective Payment Processing Fee | 2.9% + $0.30 (Stripe) / 5% + $0.50 (MoR) | Merchant of Record platforms include global VAT/sales tax compliance. |
How to use this tool. Three steps from raw inputs to founder-ready output.
- 01
Enter your startup metrics or copy inputs
Fill in the fields in the Substack Newsletter Gross Revenue Retention Calculator workspace above, or click "Load Example" to populate verified product analytics, funnel & pmf benchmark data.
- 02
Review real-time calculations & benchmark grades
Inspect the primary output, supporting unit metrics, and diagnostic rules that update instantaneously in your browser with zero server round-trips.
- 03
Copy the report or deploy your launch plan
Click 'Copy Result' to export the clean Markdown output or code snippet, then launch your product on FoundrList to compound organic traffic and high-DR backlinks.
Formula & methodology. Transparent math with zero black-box assumptions.
Core Calculation
Gross Revenue Retention Calculator: LTV = (ARPU × GrossMargin%) ÷ MonthlyChurn% · LTV:CAC = LTV ÷ CAC · Payback = CAC ÷ MonthlyGrossContribution
With default 2026 baseline inputs, the Substack Newsletter Gross Revenue Retention Calculator produces 4.03x LTV:CAC (LTV:CAC Ratio & Payback). Each customer generates $2,541 in gross-margin LTV over an average 45.5-month lifespan, yielding a 4.03:1 LTV:CAC ratio and 11.3-month CAC payback.
Questions, answered.
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Full pricing details14-Day Featured
Two weeks at the top of the home page. Live today.
$49$89
One-time payment · or $39/week, cancel anytime
- 14 days at the top of the home page
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Best valueFeature for 30 days
30-Day Featured
A full month at the top of the home page. Live today.
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- 30 days at the top of the home page
- Everything in Standard Launch
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Reach more founders. SEO backlinks, directory submissions, blog features, and weekly ads.
- SEO Boost Pack. Featured Blog Post + 50 Startup Directories bundled into one campaign.$278One-time · save $0+ vs separate
- 50 Startup Directories. Manual submission to 50 curated high-DR startup & AI directories.$179One-time · CSV proof report
- 100 Startup Directories. Manual submission to 100+ startup, SaaS & AI directories for maximum DR lift.$279One-time · full proof report
- Featured Blog Post. Permanent, SEO-optimized deep dive on FoundrList's blog with dofollow links.$99One-time · indexed on Google & AI search
- Newsletter Feature. Sponsored placement in our weekly digest sent to 2,140+ founders & investors.$25One-time · weekly founder digest
- Home + Sidebar Bundle. Both ad placements together — Home Feed + Sidebar across the entire site.$89/wkAlways-on weekly · $99 single week
- Home Feed Ad. Native sponsored card pinned inside the main FoundrList discovery feed.$39/wkAlways-on weekly · $49 single week
- Sidebar Ad. Persistent desktop right-rail placement across product, blog & tool pages.$69/wkAlways-on weekly · $79 single week
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