A percentage is incomplete without the amount it applies to. Verify your marketplace's actual fee rules before trusting a resale margin comparison.
Marketplace fees can depend on category, account status and other current terms. Use the official fee documentation for the sale you are modeling rather than copying a rate from an old article or another seller's example.
This tool supports item-only and item-plus-buyer-shipping percentage bases. If your actual rules include additional elements, account for them explicitly in your own calculation or costs; do not pretend these two options cover every policy.
Enter fixed sale fees, postage and packing as well as the percentage. Review whether a tax-related or other charge is included in your own inputs. A fee-basis change can alter profit even though the sale price and the acquisition cost stay the same.
At a 10% entered rate, adding five units of buyer-paid shipping to the percentage basis adds half a unit of fee. That is arithmetic for the stated example, not a claim about any marketplace's current rate.
A resale decision can look attractive at one optimistic price and weak at a lower price or longer holding time. Enter several price-and-time scenarios with your actual costs and fee assumptions to compare the cash outcome side by side.
Selling time is an assumption you provide, not a market forecast. Profit per assumed day is simple division and does not represent a recurring daily income. Return on item cost excludes labor and any cost you did not enter.
Inputs are processed in this page. Nothing is submitted to the app or a business. Download a result to keep it; this page does not automatically save your work.
This page does not fetch sold listings or know your marketplace's current fees. Enter the actual fee basis and rates from your account. Tax, returns and your time are separate costs unless you include them.
Sift's listing focuses on resale research, sell-through and visible buy-or-pass arithmetic. It describes estimating proceeds after platform fees and showing the sales evidence used for an estimate.
View Sift on the App StoreThe current listing requires iOS 26.0 or later. Some features have additional device requirements. Check the listing and purchase screen for current availability and terms.