Why "Revenue" Misleads You
The most common mistake in e-commerce is measuring success by revenue. Revenue is the total amount of the products you sell; but out of that amount come commission, cargo, VAT, returns, advertising and product cost. The net profit that remains is often a small percentage of revenue. A seller can post high monthly revenue and still face a cash crunch, because cost items are quietly eroding profit. A healthy business looks not at revenue but at net profit per product and per channel. To do this you must subtract all variable costs from each product's sale price and find its "contribution margin." If the contribution margin is positive the product earns; if negative, you lose on every sale. Growing without doing this analysis is like driving a car that accelerates with no clear destination. Ecomiro's analytics module produces exactly this net-profit table automatically at the product and channel level.
Cost Items: What Exactly Are You Paying?
A product's marketplace cost is made of many overlapping items. Product cost is only the first layer; on top come the category commission, the VAT on that commission, any fixed service fee, desi-based cargo, the cost of the return probability, ad spend, packaging material, and payment/operations costs. Some of these items are fixed per order, some are rate-based, and some are probability-based (for example a return does not happen on every order but at a certain rate; it must still be baked into pricing). To see true net profit you must place these items per product and subtract them from the sale price. The commission rates guide, where we handle the commission and service-fee items platform by platform, deepens the most critical rows of this table.
| Item | What it means | Often skipped? |
|---|---|---|
| Product cost | Purchase/production + freight + VAT | No |
| Commission | Category percentage (on VAT-inclusive price) | No |
| Commission VAT | VAT added to the commission invoice | Yes |
| Service fee | Fixed charge per order | Often |
| Cargo | Desi-based shipping fee | No |
| Return cost | Two-way cargo + labor | Yes |
| Advertising | Sponsored product / CPC | Often |
| Packaging | Box, filler, label, labor | Yes |
The "skipped?" column shows the items sellers forget most in practice. All must be counted for true net profit.
Read: Marketplace commission rates and service feesHow to Calculate Contribution Margin and Net Profit
The soundest way to find net profit is the contribution-margin approach. First you strip VAT out of the sale price; then you subtract all of that product's variable costs (product, commission, commission VAT, service fee, cargo, expected return cost, ad share, packaging). What remains is that product's contribution margin. When the contribution margins of all products are summed, they form a pool that covers the business's fixed costs (rent, staff, software); what is left after that is true profit. The power of this method is that it shows, one by one, whether each product really earns. Many sellers do not realize until they run this analysis that some high-revenue products have low or even negative contribution margins, while some quiet products carry the real profit. If you want to back-calculate the sale price from a target margin, the profit margin calculator does it for you.
Contribution margin = Sale price − (all variable costs). If positive, the product earns on every sale; if negative, your loss grows as volume grows. "I sell a lot but make no money" usually means a negative contribution margin.
Hidden Costs: Returns, Advertising and Operations
In cost analysis, most errors are made in the "hidden" items. Returns lead the list: a returned item incurs outbound and inbound cargo, repackaging, and sometimes value loss, and this cost is paid without earning any revenue from the sale. So you need to know the category return rate and add a "return allowance" to pricing. Advertising is the second hidden item: the ad cost of sales coming via sponsored products or cost-per-click should be written to that product's cost; otherwise a product sold through advertising is mistaken for profitable. The third is operations and packaging: boxes, tape, filler, labels and labor look small but add up to a serious amount at high volume. An analysis that ignores these items shows the product as more profitable than it is. A correct analysis puts all visible and hidden items in the same table; Ecomiro gathers these items from order data automatically and calculates net profit per product.
Tracking Cost Analysis Continuously
Cost analysis is not a one-off calculation but a process that must be monitored continuously. Commission rates are updated by category, cargo tariffs change, your product purchase cost fluctuates, your ad spend rises seasonally. A product profitable today can turn into a loss three months later as cost items shift. So net profit should be recalculated regularly, per product and per channel. Doing this manually for hundreds of products is impractical; here a tool that pulls each order's real items from the system and produces net profit automatically makes it feasible. Regular tracking shows, with data, which product to promote, whose price to adjust and which to drop from the catalog. For a setup suited to your own product set you can get information and support from the Ecomiro team.