Run the numbers before the item becomes inventory.
Quick calculators for demand, profit, and shipping decisions while you are sourcing or building a listing.
Sell-through calculator
Use the same search for sold and active listings. This version calculates sold ÷ active × 100.
Moderate demand. Check margin and competition too.
Reseller profit calculator
Estimate what is left after the item cost and the expenses that usually hide inside a sale.
This is an estimate. Taxes, promoted listing fees, returns, discounts, and other costs are not included unless you enter them in the fee fields.
Dimensional weight helper
Compare packed size with scale weight. The divisor shown here is 139 as a common domestic example; carrier rules can differ by service and change over time.
Use this as a sourcing and listing estimate, then confirm the current carrier calculation before purchasing postage.