E-commerce Margin & FBA Profit Calculator | Amazon & Shopify Unit Economics Engine

Forecast Sales, Analyze Unit Economics, & Master Your Margins in Seconds—Securely, Offline, and Directly in Your Browser.

Welcome to the E-commerce Margin & FBA Profit Calculator Pro. Stop relying on complex, error-prone spreadsheets. This is a powerful, lightweight, and completely private financial engine built specifically for Amazon FBA and Shopify sellers. It runs entirely in your web browser with zero cloud dependency.

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Experience the lightning-fast performance of serverless financial modeling. Load the built-in “Sample Data,” adjust your Manufacturing Costs or PPC Budget, and watch your Net Profit, ROI, and Margin percentages recalculate instantly—no signup required.

Core Features & Capabilities

• True Unit Economics: Instantly calculate your net profit after COGS, freight, customs, platform fees, and returns.
• Platform Fee Engine: Fully customizable inputs for Amazon FBA (Referral + Fulfillment) and Shopify ecosystem fees.
• Advanced Marketing Tracker: Analyze your PPC impact with real-time ACOS, TACoS, and blended Customer Acquisition Cost (CAC) metrics.
• Scenario Stress-Testing: Use built-in sliders to simulate price changes or cost fluctuations to see the immediate impact on your bottom line.
• Return & Refund Modeling: Accurately quantify the “hidden tax” that returns and damaged inventory impose on your business.

Forecasting, Valuation & Reporting

• Monthly Financial Projections: View automated forecasts of your gross revenue and net monthly profit based on sales volume.
• Professional PDF Reporting: Generate clean, print-ready profitability reports for your team or potential investors with one click.
• Data Portability: Export your entire financial model to a secure JSON file to keep offline backups or share with your co-founders safely.

Absolute Data Ownership & Security

• Offline-First & Serverless: Your margin data, sourcing costs, and PPC strategies live exclusively inside your device’s memory (IndexedDB).
• Zero-Setup: Start in 5 seconds. Load pre-built sample data for sandbox testing, or use the “Factory Reset” feature to clear your workspace.
• Pay Once, Own Forever: No monthly SaaS fees, no hidden cloud subscriptions. Own your profit engine for life.

Who Is This For?

• Amazon FBA Sellers: Stop being surprised by your payouts. Know your margin on every single unit sold.
• Shopify Brand Owners: Optimize your ad spend and master your unit economics for scalable growth.
• E-commerce Consultants: Provide instant, accurate, data-backed financial analysis to your clients before they commit to inventory.