The most dangerous number in e-commerce is a fake gross margin. Many store owners calculate their profit by simply subtracting the cost of manufacturing from the retail price. They forget the silent fees that drain cash flow before the money ever hits their bank account.
If you scale ad campaigns without calculating a strict break-even point that includes gateway fees and shipping, you will run out of cash while generating record sales.
The True Cost of Goods Sold (COGS)
To find your actual break-even point, you must sum these four metrics:
- Product Cost: The raw manufacturing cost.
- Fulfillment Cost: Pick, pack, and shipping fees.
- Gateway Percentage: E.g., Stripe/Shopify Payments taking 2.9%.
- Gateway Fixed Fee: The standard $0.30 per transaction.
Calculating Your Absolute Floor
Your Break-Even ROAS is the exact multiplier your ad campaigns must hit so you neither make nor lose money. It is calculated as: 1 / (True Gross Margin %).
If your true gross margin after all hidden fees is 45%, your Break-Even ROAS is 2.22x. If your Facebook ads drop to 2.1x, you must pause them immediately.
To eliminate the guesswork, run your exact product costs through our Break-Even Margin Calculator to find your absolute ad performance floor in seconds.