How ecommerce profit should be calculated
Cross-border ecommerce profit is not simply the gap between purchase cost and selling price. A real unit model should include product cost, packaging, first-mile and last-mile freight, warehouse handling, marketplace fees, payment fees, advertising cost, returns, damages, coupons, and exchange rate impact. This calculator helps Amazon FBA, Shopify, TikTok Shop, and multi-channel sellers test whether a product has enough margin before ordering inventory or scaling ads.
Start with your target selling price, then enter the average cost per unit for sourcing, freight, platform fees, ad spend, and expected return loss. If your data is still uncertain, use conservative assumptions. A common early model is 3%-8% for returns and loss, 10%-25% of selling price for advertising, and a separate buffer for samples, packaging, payment fees, and customer support. The net profit number shows what remains per order, while the margin percentage helps you compare products with different price points.
Why break-even ACOS matters
Break-even ACOS is the highest advertising cost of sales your product can tolerate before ad orders become unprofitable. If your real ACOS stays below that number, the ad order can still leave margin. If it stays above it for too long, you need to improve conversion rate, reduce CPC, raise price, or cut unit costs. New products can temporarily accept thinner margin for learning, but sustained loss-making ads create pressure on inventory and cash flow.
FAQ
What margin is healthy?
It depends on category and return risk, but a mature product below 10% net margin is usually tight. A 15%-25% margin leaves some room for ads and promotions, while 25%+ is more comfortable for testing and scaling.