Calculate Real eCommerce Profit Margins
The hidden costs beginners forget when calculating profit margins — and how to calculate unit economics accurately.
Margin is often calculated with just two numbers — the selling price minus the purchase price. Before you get to an online store's profit, though, there are several more costs, and taking them into account is what saves a "profitable" product from a loss.
Why simple subtraction is wrong
Imagine a product that you buy for 15 GEL and sell for 35 GEL. At first glance that is 20 GEL of profit, a margin of almost 60%. But from that 20 GEL you first have to subtract the cost of delivery from the supplier to the customer, the payment system's fee (a percentage of the selling price — your bank will tell you the rate) and the advertising cost of that particular sale, if you use advertising. Where it applies, the cost of returned or damaged goods is added here as well. After that, the 20-GEL "profit" may come down to 4-5 GEL — or disappear altogether.
The difference between "margin" and "markup"
The two terms are often mixed up with each other, but they mean different things. Markup is how much more you sell for than the purchase price — for example, if something bought for 20 GEL is sold for 30 GEL, the markup is 50%. Margin, on the other hand, is calculated from the selling price, not from the purchase price — in the same example the margin is about 33%. The difference looks small, but it plays a big role when you plan — if you calculate with the logic of markup, you may think the margin is higher than it really is.
Which costs to include in the calculation
Purchase price. This is the amount you pay the supplier per unit — it is the most obvious cost, and everyone remembers it.
Delivery cost. Either you pay it or the customer does — in both cases this cost has to show up in the calculation, even if you offer the customer "free delivery" (in that case the cost comes off your margin, not off the customer).
Payment fee. Card payment systems, bank transactions — each one has its own percentage fee, which is deducted from the selling price, not from the purchase price.
Advertising cost per unit. If you use advertising on social networks, divide the total advertising budget by the number of sales — you get the advertising cost per sale. This number changes over time, so recalculate it periodically.
Returns/damage. No store has a 0% return rate. It is sensible to count your own store's average (for example, 4 returns in 100 orders) as a cost, even if fewer returns happen in a particular month.
What to do when a cost is variable
Some costs (the purchase price) are usually stable, while others (the advertising cost per unit) change from one day to the next. With variable costs it is useful to work out three scenarios — the best, the average and the worst — instead of one exact number. If the margin is positive even in the average scenario, the product is far more reliable than one that works only in the best case.
How to calculate margin in practice
It is possible to calculate this by hand in a spreadsheet, but it is also easy to make a mistake — especially when working out percentage fees. That is exactly why the margin calculator on dropship.ge is set up — you enter the selling price, the purchase price, delivery, the advertising cost and the fee percentages, and the calculator works out the rest instantly, right in the browser, without sending the data anywhere.
How much margin is "enough"
There is no single exact answer — it depends on the category, on the volume and on your cost structure. There is a practical rule, though: if even in the best scenario (the lowest purchase price, the most effective advertising) the margin is below 15-20%, very little room is left for error — one unplanned cost (for example, a delivery delay or additional returns) will eat the whole profit. This is one of the main criteria to take into account when choosing a niche, already at the stage of comparing products.
A common mistake: calculating margin only once
Margin is not a number that you calculate once and then forget. The supplier's price, the payment fee, the effectiveness of your advertising — everything changes over time. It is good practice to recalculate the margin of your main products at least once a month and to make sure that it is still positive.
Why you should not lower the price at the expense of margin
When sales are low, a beginner often tries to attract customers by lowering the price. Sometimes this works, but if lowering the price also reduces the margin to a level where even one additional cost pushes you into a loss — that is not a solution, it is postponing the problem. A better approach is to first find out why people are not buying (the price? trust? the description? the pictures?) and then to address exactly that problem — lowering the price should be the last option, not the first.
Why margin differs between product categories
Some categories (for example, small accessories) naturally give a higher percentage margin, because delivering them is cheap compared with the selling price. Other categories (for example, large or heavy items) often show a lower percentage margin, because delivery "eats" a large part of the selling price. Because of this, it is wrong to compare different categories against a single "desired margin" standard — each category has its own realistic range, which you find out by testing, not from one general rule.
What to do when the margin is small but the volume is large
Some product categories naturally give a thin margin, but make up for it with large volume. This strategy works only if the operational process — processing orders and communicating with customers — can withstand large volume. Otherwise, a thin margin and a slowed-down process together create a loss faster than a model of high margin and slow sales does.
How to compare margin across different suppliers
The same product often has a different price at several suppliers. If one supplier is cheap, but delivery is slow or communication is weak, the low purchase price may not be worth it in the end. Late orders and dissatisfied customers are a cost too, even if it is not reflected directly in money. When you compare margins, it is worth taking into account not only the number, but the whole experience that each supplier gives you.
Why it is better not to simply "round" your costs
Some people choose a simple rule — for example, "I will multiply the purchase price by three" — instead of precision. This works as long as the cost structure is stable, but it goes wrong as soon as the category changes (for example, a heavy or bulky product, where delivery is disproportionately expensive). Rules are useful for a quick estimate, but before the final decision an exact calculation is worth doing — especially during the first test of a new category.
Which costs to write down before you approve a product
Before you start the calculation, it is worth writing down all five costs together: the purchase price, delivery, the payment fee, the advertising cost per unit and the average cost of returns. This list keeps you from forgetting any of the items — and when you see all five together, it is much clearer where the margin may be shrinking if the final number is unsatisfactory.
Next step: opening the store
Calculating margin makes sense only when the purchase price is real — not an expected one. For that you need a verified supplier whose real price and delivery time you trust. When the numbers are positive and sustainable, the next step is to open the store and start selling. On Sellit this process is completed in hours, with a 0% commission on every plan (source: sellit.ge).