---
title: "Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator | FoundrList Free Tools"
description: "Model Customer Lifetime Value (LTV), LTV:CAC ratio, and CAC payback months for your Commercial Open Source (COSS) business."
ai_summary: "Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator: Model Customer Lifetime Value (LTV), LTV:CAC ratio, and CAC payback months for your Commercial Open Source (COSS) business. Free browser-based saas & startup finance tool on FoundrList with instant calculations, industry benchmarks, and Markdown (.md) export."
canonical_url: "https://www.foundrlist.com/tools/open-source-commercial-ltv-cac-calculator"
markdown_url: "https://www.foundrlist.com/tools/open-source-commercial-ltv-cac-calculator.md"
category: "SaaS & Startup Finance"
category_url: "https://www.foundrlist.com/tools/category/saas-finance"
engine_kind: "formula-calculator"
keywords:
  - "open source commercial ltv cac calculator"
  - "commercial open source (coss) calculator"
  - "commercial open source (coss) ltv cac calculator"
  - "saas financial calculator"
  - "startup metrics calculator"
---

# Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator

Model Customer Lifetime Value (LTV), LTV:CAC ratio, and CAC payback months for your Commercial Open Source (COSS) business.

## Formula & Methodology
`LTV = (ARPU × GrossMargin%) ÷ MonthlyChurn% · LTV:CAC = LTV ÷ CAC · Payback = CAC ÷ (ARPU × GrossMargin%)`

**Default Benchmark Result (LTV:CAC Ratio & Customer LTV):** 25.0x LTV:CAC ($12,245 LTV)
Each customer generates $12,245 in gross-margin LTV over 47.6 months, yielding a 25.0x LTV:CAC ratio and 1.9-month CAC payback.

## Default Inputs
- **Average Monthly Revenue Per User (ARPU)** (`a`, currency): Default = `299`
- **Gross Margin (%)** (`b`, percent): Default = `86`
- **Monthly Logo Churn Rate (%)** (`c`, percent): Default = `2.1`
- **Customer Acquisition Cost (CAC)** (`d`, currency): Default = `490`

## Sample Output Metrics
- **Customer Lifetime Value (LTV):** $12,245
- **LTV : CAC Ratio:** 25.0x
- **CAC Payback Period:** 1.9 mos
- **Avg Customer Lifespan:** 47.6 mos
- **Monthly Gross Margin / User:** $257.14

## How to Use
1. **Enter your startup metrics or copy inputs:** Fill in the fields in the Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator workspace above, or click "Load Example" to populate verified saas & startup finance benchmark data.
2. **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.
3. **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.

## 2026 Industry Benchmarks
- **Top-Quartile B2B SaaS LTV:CAC:** 4.0x – 6.5x — _3.0x is the standard venture & bootstrapped threshold._
- **Median CAC Payback Period:** 6 – 14 months — _PLG and self-serve products target < 6 months._
- **Healthy Net Revenue Retention (NRR):** 105% – 125% — _Expansion revenue offsets gross logo churn._

## Frequently Asked Questions

### How does the Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator work?
Model Customer Lifetime Value (LTV), LTV:CAC ratio, and CAC payback months for your Commercial Open Source (COSS) business. All calculations, scoring rules, and templates run 100% client-side in your browser for instant feedback without sending private startup metrics to a server.

### What benchmarks does this saas & startup finance tool use?
The Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator uses current 2026 SaaS, indie hacker, and venture benchmarks across B2B SaaS, AI products, developer tools, and bootstrapped startups so you can compare your numbers against top-quartile performers.

### Is the Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator completely free to use?
Yes — every tool in the FoundrList Founder Tools suite is 100% free with no signup wall, usage cap, or watermark, and includes a clean Markdown twin (.md) for AI agents and coding assistants.

### How do I get more traffic and backlinks after using the Commercial Open Source (COSS) LTV:CAC & Payback Period Calculator?
Submit your product on FoundrList (/agent) to compete on the weekly launch leaderboard, earn a permanent high-DR dofollow backlink, or launch today for $29 (Standard Launch), book 50 Directory Submissions for $179 or 100 for $279, or grab the $278 SEO Boost Pack (/pricing) to distribute your startup everywhere.

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