--- title: "Micro-SaaS Rule of 40 & SaaS Magic Number Calculator | FoundrList Free Tools" description: "Benchmark your Micro-SaaS startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency." ai_summary: "Micro-SaaS Rule of 40 & SaaS Magic Number Calculator: Benchmark your Micro-SaaS startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. 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/micro-saas-rule-of-40-magic-number-calculator" markdown_url: "https://www.foundrlist.com/tools/micro-saas-rule-of-40-magic-number-calculator.md" category: "SaaS & Startup Finance" category_url: "https://www.foundrlist.com/tools/category/saas-finance" engine_kind: "formula-calculator" keywords: - "micro saas rule of 40 magic number calculator" - "micro-saas calculator" - "micro-saas rule of 40 magic number calculator" - "saas financial calculator" - "startup metrics calculator" --- # Micro-SaaS Rule of 40 & SaaS Magic Number Calculator Benchmark your Micro-SaaS startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. ## Formula & Methodology `Rule of 40 = YoY ARR Growth (%) + Free Cash Flow Margin (%)` **Default Benchmark Result (Efficiency-Adjusted Valuation):** $706,860 At $102,000 ARR with 45% YoY growth and 88% gross margin, estimated valuation is $706,860 (6.9x ARR). ## Default Inputs - **Current Monthly Recurring Revenue (MRR)** (`a`, currency): Default = `8500` - **YoY Revenue Growth Rate (%)** (`b`, percent): Default = `45` - **Net Dollar Retention (%)** (`c`, percent): Default = `112` - **Operating / Gross Margin (%)** (`d`, percent): Default = `88` ## Sample Output Metrics - **Estimated Valuation:** $706,860 - **Annualized Run Rate (ARR):** $102,000 - **Implied ARR Multiple:** 6.9x ARR - **Valuation Range:** $579,625 – $862,369 - **Rule of 40 Score:** 78.0% ## How to Use 1. **Enter your startup metrics or copy inputs:** Fill in the fields in the Micro-SaaS Rule of 40 & SaaS Magic Number 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 Micro-SaaS Rule of 40 & SaaS Magic Number Calculator work? Benchmark your Micro-SaaS startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. 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 Micro-SaaS Rule of 40 & SaaS Magic Number 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 Micro-SaaS Rule of 40 & SaaS Magic Number 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 Micro-SaaS Rule of 40 & SaaS Magic Number Calculator? Submit your product on FoundrList (/agent) to compete on the weekly launch leaderboard, earn a permanent high-DR dofollow backlink, or book the $97 100-Directory Submission service (/pricing) to distribute your startup everywhere. ## Related Free Tools - [Developer Tools Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/devtools-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/devtools-rule-of-40-magic-number-calculator.md)) — Benchmark your Developer Tools startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. - [Chrome Extension Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/chrome-extension-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/chrome-extension-rule-of-40-magic-number-calculator.md)) — Benchmark your Chrome Extension startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. - [Mobile App Subscription Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/mobile-app-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/mobile-app-rule-of-40-magic-number-calculator.md)) — Benchmark your Mobile App Subscription startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. - [Shopify App Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/shopify-app-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/shopify-app-rule-of-40-magic-number-calculator.md)) — Benchmark your Shopify App startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. - [API-First Startup Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/api-product-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/api-product-rule-of-40-magic-number-calculator.md)) — Benchmark your API-First Startup startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. - [Fintech SaaS Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/fintech-saas-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/fintech-saas-rule-of-40-magic-number-calculator.md)) — Benchmark your Fintech SaaS startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. - [Productized Agency Rule of 40 & SaaS Magic Number Calculator](https://www.foundrlist.com/tools/productized-service-rule-of-40-magic-number-calculator) ([.md](https://www.foundrlist.com/tools/productized-service-rule-of-40-magic-number-calculator.md)) — Benchmark your Productized Agency startup's Rule of 40 efficiency score (YoY ARR growth + EBITDA/FCF margin) and sales efficiency. ## Launch & Distribute Your Startup on FoundrList - **Free Launch & Weekly Leaderboard:** [https://www.foundrlist.com/agent](https://www.foundrlist.com/agent) - **100-Directory Submission ($97) & Featured Plans:** [https://www.foundrlist.com/pricing](https://www.foundrlist.com/pricing)