Deduct platform, listing & payment fees to find your net margin
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Enter a valid price (0.5-100,000)
$
Enter a valid cost (0-100,000)
$
Enter a valid shipping fee (0-100,000)
$
Enter a valid listing fee (0-100,000)
%
Enter a valid fee % (0-60)
%
Enter a valid fee % (0-10)
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Enter a valid fixed fee (0-100)
Net Profit
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Margin
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Revenue
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Net Margin
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Break-even
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Total Platform Fees
Product Cost--
Shipping--
Platform Fee--
Payment Fee--
Listing Fee--
Net Profit--
Profit Calculator — Complete Guide
What this calculator does
The Profit Calculator converts a selling price and a list of costs into one honest number: the net profit left after every fee is paid, and the margin that profit represents. You enter the price you plan to charge, the product cost, shipping, the listing fee, the marketplace commission, and the payment processor's percentage and fixed charge. The tool subtracts all of them and shows what actually lands in your pocket.
It also returns the total platform fees, the break-even price — the lowest price at which you neither make nor lose money — and a visual breakdown of where every dollar of revenue goes. That breakdown is what separates a healthy listing from one that quietly bleeds cash.
Notice that every percentage fee is charged on the selling price, not on your cost. A 12.9% commission on a $50 sale costs $6.45, while the same rate on a $20 sale costs only $2.58. Because fees scale with revenue, low-priced items are squeezed much harder than high-priced ones, and a small price cut can erase a surprisingly large share of profit.
A worked example
You sell an item for $39.99. The product costs $15.00, shipping is $6.50, and the listing fee is $0.30. The marketplace charges 12.9% and the payment processor charges 2.9% plus $0.30.
A margin near 29% looks strong. But the same fee structure behaves very differently across price points, as the table below shows for the identical product and shipping profile.
Selling price
Total costs
Net profit
Net margin
$19.99
$25.26
−$5.27
−26.4%
$29.99
$23.36
$6.63
22.1%
$39.99
$28.42
$11.57
28.9%
$49.99
$33.48
$16.51
33.0%
At $19.99 the very same product loses money once shipping and fees are counted. Raising the price to $29.99 does not merely add $10 of profit — it lifts the margin from negative to over 22%, because the fee percentage is unchanged while the fixed costs are spread across more revenue.
Tips, mistakes and edge cases
Treat the break-even figure as a hard floor. Never discount below it unless you are deliberately clearing stock.
Include shipping even when the buyer pays it — if the label costs more than you charged, the difference is a real cost.
Percentage fees are not negotiable, but price is. When a listing is thin, adjusting the price usually beats cutting product quality.
Update the platform percentage whenever a marketplace changes its schedule; a one-point change can swing margin by several percent.
Remember that returns, advertising and packaging sit outside this model — leave a buffer of 5–10% of revenue if those costs apply.