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Return rate impact calculator
Enter the sale price, product and fulfilment costs, the return shipping charge, the return rate and the share of returned units that can be resold. The calculator spreads the cost of returns across every sale and shows the remaining margin.
The model treats each return as a shipping cost plus the unrecoverable share of product cost; it does not include inspection, refurbishment, disposal, payment disputes or the cash-flow delay of a refund.
The cost of a single return
A return usually costs more than the outbound shipment. The calculator adds the return shipping charge to the part of product cost that cannot be recovered. If 70% of returned units can be resold as new, the remaining 30% of cost is treated as lost, which covers the unit that is damaged, incomplete or unsellable.
That is a deliberately simple treatment. It does not add inspection labour, repacking materials, cleaning, a temporary price cut to clear the unit, or disposal. If your returns often need those steps, raise the return shipping input or lower the resellable share until the per-return cost matches your records.
Turning a rate into a per-sale number
Expected return cost multiplies the cost of one return by the return rate. At an 8% rate and a $7.90 cost per return, roughly $0.63 is carried by every sale. Net profit per sale subtracts that amount from gross profit, and margin expresses the result as a share of price.
Break-even return rate answers a different question: how high the rate can go before expected return cost consumes the whole gross profit. It divides gross profit by the cost of one return. A product with thin margin and expensive returns reaches that line quickly, even when its headline return rate looks normal for the category.
What the model does not decide
Returns are not uniform. A sizing return, a damaged item and a late delivery have different costs, and some are preventable. The model uses one average rate and one average recovery share, so it cannot show which cause to fix first.
It also excludes refunded marketplace fees, payment disputes, outbound shipping that is not recovered, tax adjustments and the cash-flow delay between refund and resale. Margin here is before advertising and overhead. Use the result to size the return line and to test scenarios, then check the actual recovery rate from your own returns data rather than treating the default as a fact.
Frequently asked questions
What is the resellable share?
It is the proportion of returned units that can go back into sellable stock. The rest is treated as a write-off, so a 70% share means 30% of product cost is lost on each return.
Why is only part of the product cost counted?
A returned unit still has value if it can be sold again. Counting the full cost would double-count inventory that returns to stock, while counting nothing would ignore damaged and incomplete units.
What does break-even return rate mean?
It is the return rate at which expected return cost equals gross profit per sale, leaving zero margin before advertising and overhead. Above that rate, the average sale loses money on this model.
Should refunded payment fees be included?
They are not in this model. If your processor keeps the fixed fee or part of the percentage on refunds, add that amount to the return shipping input or model it separately.
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