Ecommerce profit calculator
Enter one month of figures and see net revenue, contribution margin and net profit — including the shipping gap and return handling most profit calculations leave out.
- Net revenue
- €88,000
- Contribution margin
- €37,200
- Net profit
- €16,200
Net margin on gross revenue: 16.2%. Your shipping gap (carrier cost minus shipping charged) is €3,500 this month.
The formula
- Net revenue = gross revenue − refunds − discounts.
- Contribution margin = net revenue − COGS − payment fees − (carrier cost − shipping charged) − packaging and picking − return handling.
- Net profit = contribution margin − advertising − fixed overhead.
- Net margin = net profit / gross revenue.
Worked example
€100,000 gross revenue, €7,000 refunds and €5,000 discounts gives €88,000 net revenue.
At 45% COGS (€39,600), 2.5% fees (€2,200), a €3,500 shipping gap, €3,100 packaging and €2,400 return handling, contribution margin is €37,200.
After €12,000 advertising and €9,000 fixed costs, net profit is €16,200 — a 16.2% net margin on gross revenue.
How to use the result
- ◆Take carrier cost from invoices, not from your shipping settings — surcharges are usually the difference.
- ◆Keep advertising separate so you can also read contribution margin, the number that tells you whether more volume helps.
- ◆Run the same month next quarter to see whether your changes moved anything.
Frequently asked questions
Why is my net profit lower than my accounting software shows?+
Most sales reporting compares gross revenue against COGS only. This calculation also subtracts refunds, discount value, the shipping gap and return handling, which is where the difference usually sits.
What is the shipping gap?+
The difference between what carriers invoice you and what customers paid for shipping. In many stores it is the second largest leak after returns.