Ecommerce Margin Scenario Builder
For Amazon FBA sellers, dropshippers and small business owners. Calculate margins, markup, selling prices and break-even in seconds — no sign-up, no watermark.
1. Selling Price & Volume
2. Cost of Goods & Logistics
3. Platform & Processing Fees
4. Marketing, Returns & Loss
5. Custom Additional Fees
Calculating guidance...
Cost Breakdown per Unit
Scenario Sensitivity Analysis
Profit vs. Selling Price Curve
Pricing Ladder & Target Margins
| Selling Price | Change | Net Margin | Profit / Unit | Monthly Profit | Units to Break-Even |
|---|
About the Ecommerce Margin Scenario Builder
BizMargin gives small business owners, Amazon FBA sellers, dropshippers, and DTC brand founders a fast, no-signup way to run unit economics calculations that usually mean messy spreadsheets or accountant fees. Calculate net profit margins, break-even prices, max ACoS, and target pricing ladders instantly in your browser — 100% free, no watermark, no credit card required.
Who This Is For
Amazon & Marketplace Sellers: Determine true net margin after FBA referral, fulfillment, storage fees, and ad spend.
Shopify & DTC Brand Owners: Work backwards from a target 30%+ profit margin to calculate the exact selling price required.
Etsy & eBay Creators: Factor in transaction fees, shipping costs, refund rates, and damaged inventory losses to protect your bottom line.
Frequently Asked Questions
Is this tool actually 100% free?
Yes — no account signup, no credit card, no usage limits. The calculator runs entirely in your browser as many times as you need.
Does it store or transmit my financial data?
No. All calculations run locally on your device. Nothing you enter is transmitted or saved to external servers.
How accurate are the profit margin calculations?
Calculations use exact unit economic formulas subtracting product COGS, shipping, platform referral %, storage, transaction fees, TACoS ad spend, and loss percentages.
How does Target Margin Finder work?
Instead of guessing prices, you enter your desired net profit margin (e.g. 30.0%). The calculator solves the reverse equation to show your required selling price.