32 is the example result. Read it using the units and relationship stated below.
Reseller Profit uses sale price, item cost, platform fee (%).
Protecting contribution before accepting a price
For reseller profit, the relationship is Result = [Sale price] − [Item cost] − [Sale price] × [Platform fee (%)] ÷ 100 − [Shipping] − [Other costs]. The amount depends on the supplied sale price, item cost, rather than a live market price or a value imported from another record. A quote can meet a revenue target and still leave too little to cover delivery. Separate the selling-price denominator from the cost denominator: margin and markup answer different questions. A discount changes contribution even when the supplier cost stays fixed.
What the model includes
Result = [Sale price] − [Item cost] − [Sale price] × [Platform fee (%)] ÷ 100 − [Shipping] − [Other costs] A pricing review should retain the supplier cost, sale price and the reason for any allowance. Returns, payment charges, delivery and tax require explicit treatment; they should not disappear inside a percentage labelled profit. Compare the proposed price with the customer agreement and delivery capacity. A mathematically achievable margin does not establish that buyers will accept the offer.
Example with the supplied inputs
Sale price: 100; Item cost: 45; Platform fee (%): 10; Shipping: 8; Other costs: 5. Result: 32. The values are illustrative.
Compare one changed input
Sale price changes from 100 to 110. The result becomes 41. All other inputs remain fixed.
Calculation rule
Result = [Sale price] − [Item cost] − [Sale price] × [Platform fee (%)] ÷ 100 − [Shipping] − [Other costs]
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Sale price | 100 | Use sale price on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
| Item cost | 45 | Use item cost on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
| Platform fee (%) | 10 | Enter platform fee (%) on the percentage scale used in the formula (20 means 20%, not 0.20). Keep its base and reporting period consistent with the other inputs. |
| Shipping | 8 | Use the source quantity represented by shipping. Keep the counted population fixed and avoid mixing a unit value with a period total. |
| Other costs | 5 | Use other costs on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
Output: 32 is the example result. Read it using the units and relationship stated below. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Sale price, Item cost, Platform fee (%). Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Sale price on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 32.
Change Sale price from 100 to 110 while keeping every other value fixed. The result becomes 41. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026