Ecommerce Unit Economics: How Much Profit Does One Order Really Generate?

An online store sells a product for €75.

The product itself costs €35.

At first glance, the business has made €40.

But that is not the real profit.

There may still be payment fees, delivery, packaging, fulfilment, advertising and return costs to pay.

By the time everything is included, the amount left from that €75 order may be much smaller.

That is exactly what ecommerce unit economics helps to reveal.

What is ecommerce unit economics?

Unit economics shows how much a business earns or loses from one unit of activity.

For an online store, the most useful unit is often one completed order.

Instead of looking only at revenue, the calculation considers the variable costs created by that order.

This helps answer practical questions:

Can the store afford a discount?

Is free shipping profitable?

How much can be spent on advertising?

Which products have healthy margins?

Does increasing order volume actually improve profit?

Which costs should be included?

A basic order profitability calculation may include:

product cost;

payment processing;

packaging;

fulfilment;

shipping paid by the retailer;

advertising or acquisition cost;

expected return costs;

marketplace fees where relevant.

Taxes and VAT need to be handled according to the accounting setup of the business.

The important point is to avoid counting the same cost twice.

A simple example

Imagine an order worth €75.

That €19 is not necessarily final profit.

The business still has fixed costs such as:

salaries;

software;

hosting;

warehouse rent;

accounting;

administration.

But it shows how much this order contributes towards covering those costs and generating profit.

Why revenue can be misleading

Consider two stores.

Store A receives 100 orders and keeps €20 contribution from each order.

Store B receives 200 orders but keeps only €7 from each one.

Store A generates €2,000 contribution.

Store B generates €1,400.

Store B has twice as many orders but weaker economics.

This is why order volume alone is not enough to judge ecommerce performance.

Discounts can damage margin faster than expected

Suppose the €75 product receives a 10% discount.

The customer now pays €67.50.

But product cost, packaging and shipping remain almost unchanged.

The discount is taken directly from the margin.

A promotion that looks small from the customer's point of view can therefore remove a large percentage of the retailer's contribution.

This is why discounts should be tested against unit economics before a campaign goes live.

Free shipping works the same way

Free delivery can improve conversion and increase average order value.

But the shipping company still needs to be paid.

If the customer adds enough extra products to create additional margin, the offer may work well.

If not, the store simply absorbs another cost.

This is why a free-shipping threshold should be based on order economics rather than copied from competitors.

Returns should be treated as an expected cost

Returns are particularly important in categories such as fashion and footwear.

A returned item may be resold.

But the original order may already have created costs:

outbound shipping;

return shipping;

payment processing;

packaging;

fulfilment;

inspection.

Instead of ignoring this, the retailer can calculate an average expected return cost per order.

For example, if 8% of orders are returned and the average unrecoverable cost of a return is €12, the expected return cost is €0.96 per order.

This makes the model more realistic.

Customer acquisition cost matters

Advertising is another major part of unit economics.

If an order generates €18 in contribution before marketing but costs €20 to acquire, the first purchase is not profitable.

That does not automatically mean the campaign is bad.

A retailer with strong repeat purchase behaviour may recover the acquisition cost through later orders.

But then the business needs to understand customer lifetime value rather than looking at the first order in isolation.

Repeat customers change the calculation

A first order may be expensive because the retailer pays for advertising.

The second order may arrive through email, direct traffic, loyalty or a mobile app.

That means acquisition cost can fall significantly.

This is one reason customer retention matters so much.

A business with healthy repeat purchases can often afford a higher acquisition cost than a store where every customer buys only once.

Cross-border sales need separate economics

European ecommerce often involves several countries.

Shipping costs, payment methods and return rates can vary significantly between markets.

An order to a domestic address may cost €5 to deliver.

The same parcel sent across borders may cost €12 or more.

Payment fees may also differ.

That means a single profitability model for every country can be misleading.

Cross-border stores should ideally calculate unit economics by market or delivery zone.

PrestaShop already contains part of the data

PrestaShop stores already have useful information such as:

product prices;

product costs where maintained;

orders;

discounts;

shipping;

customer history.

This can be combined with information from:

payment providers;

advertising platforms;

fulfilment systems;

return data.

For Ewonta stores built on PrestaShop, these data can become the foundation for deeper reporting and business automation.

The goal is not to create more dashboards.

It is to make the economics of every order easier to understand.

Revenue tells you how much customers paid.

Unit economics tells you how much value remains after the costs required to generate that sale.

Before increasing advertising budgets, launching aggressive discounts or offering free shipping, it is worth checking one simple thing:

Does each additional order actually improve the economics of the business?

Growth is useful only when the underlying order remains financially sustainable.