Sourcing decisions are where most ecommerce profitability is determined — long before the first ad runs. A product with thin margins cannot be saved by clever marketing; a product with strong margins forgives marketing mistakes. Yet most operators run sourcing decisions on gut feel and supplier-quoted COGS, never modeling the full landed economics including ads, shipping, and returns.
The math this calculator does is simple but rigorous. Retail price minus supplier cost minus shipping minus payment processing minus expected ad spend equals net profit per sale. The non-obvious insight is that "ad spend per sale" is the largest variable and the one operators most often underestimate. Tutorials show 70% gross margin and call it a winner; real CPA on Meta in 2026 averages $20-40 for impulse products and $40-80 for considered purchases. Subtract that from gross profit and many "winners" become break-even at best.
Breakeven CPA — the maximum you can pay per acquisition before losing money — is the most useful number this tool produces. It tells you exactly how much ad spend headroom you have. A product with $30 breakeven CPA and an expected $18 CPA gives you $12/order of profit and meaningful room for ad costs to drift up. A product with $15 breakeven CPA and an expected $18 CPA loses money in expectation and only works if you nail ad performance from day one.
Use this tool early — before placing supplier orders, before designing landing pages, before any commitment. If the green-light verdict requires perfect ad performance, the product probably won't work in practice. Pair this with the Dropshipping Margin Calculator (for fuller variable cost modeling) and the LTV:CAC tool (to model multi-purchase economics for repeatable products). Better to find out a product won't work in 5 minutes of math than 5 months of running ads.
Frequently asked questions
What margin should a new product hit before I source it?
For dropshipping/POD: target 30%+ net margin after ads. For private label DTC: target 50%+ gross margin and 15%+ net margin after first-purchase CAC. Below those thresholds, you cannot absorb ad cost variability or fund retention investments. Many "winning products" on TikTok and YouTube tutorials show 80% gross margin in calculators but ignore CAC and returns — real margins are half what tutorials claim.
What is "breakeven CPA" and why does it matter?
Breakeven CPA is the maximum you can spend on ads per sale before the order becomes unprofitable. It equals retail price minus all non-ad costs (COGS, shipping, processing). If your breakeven CPA is $12 and your actual CPA is $8, you make $4 per order. If your actual CPA is $15, you lose $3 per order. Without knowing breakeven CPA, you can't set realistic ad spend targets.
What if my CPA is unknown for a new product?
Assume the worst end of category benchmarks: $20-30 for general DTC, $15-25 for impulse-buy categories, $30-50 for considered purchases. If the math works at the high end of typical CPA, you have margin headroom. If it only works at the low end, you are betting on perfect ad performance — which rarely happens in months 1-3 with a new product.
How does the green/yellow/red verdict work?
Green = healthy margin, breakeven CPA gives ad spend headroom, decent profit per order. Yellow = marginal — works if ads perform, fails if they don't. Red = doesn't work even with strong ad performance. The thresholds factor in net margin %, profit per order in dollars, and the ratio of breakeven CPA to assumed CPA. Aim for green; only proceed with yellow if you have specific reasons to believe ad costs will be low.
What should I research besides margin?
Margin is necessary but not sufficient. Also research: product seasonality (is this a 90-day fad or evergreen?), competition (are 50 dropshippers selling identical products?), shipping economics (heavy or fragile = bad), return rate likelihood (apparel/electronics = high, accessories = low), and whether the supplier can actually fulfill at volume. A product with 50% margin that ships from China with 20-day delivery and 25% return rate is worse than 30% margin from a US supplier with 3-day delivery.