Healthy ecommerce profit starts with fully loaded order costs, not headline revenue
Online-store unit economics usually break when sellers understate fees, fulfillment, returns, or acquisition cost. The SBA guidance on startup costs and market research is a useful official baseline before scaling.
"The best ecommerce pricing decisions come from contribution margin and ad headroom, not from gross sales alone."
Count every order-level leakage
Include packaging, payment fees, reserve for returns, and operational overhead instead of focusing only on product cost.
Use max ad spend before scaling
If your allowable acquisition cost is thin, apparent growth can quickly become cash burn.
Watch price and shipping together
Shipping charged can support margin, but only if it survives the fee stack and real fulfillment cost. Review expense treatment with the IRS business expense resources.
Frequently Asked Questions
Yes. The calculator treats item price plus shipping charged as the buyer payment. That is the amount from which marketplace fees, payment processing, return reserve, and variable costs are covered.
Max ad spend shows how much one order can absorb in acquisition cost before net profit falls to zero. It is often the fastest way to judge whether a campaign can scale without destroying margin.
