Check the cost between your supplier and your customer.

A worked order: where a $5 product becomes $8.62

This is an illustrative US import, not a tariff quotation. Suppose 100 units cost $500, freight is $120, your confirmed combined duty rate is 10% of goods value, and clearance costs $30. Import sales tax is set to zero for this example.

Open the $7.00 scenario. Change only freight to $282 to reproduce the second case. If 10% of the stock is unsellable, divide the $700 shipment cost by 90 sellable units: $7.78 each, before selling costs.

On a $20 sale, a 15% referral fee, $4.50 fulfilment fee, $1 advertising allowance and $0.50 return reserve leave $4 before subscriptions and overhead when landed cost is $7. At $8.62 landed, the same order leaves $2.38. That is why a packaging or freight decision belongs in a profit worksheet.

What these tools help you check

• Packaging: compare actual and dimensional weight in centimetres or inches; test whether reducing each side crosses a billing increment.
• Importing: separate goods, freight, duty, tax and clearance. Enter the commodity-specific duty rate and use a single currency.
• Selling: bring the fee from your seller account, then add costs that a headline marketplace percentage omits.
• Freight planning: test carton orientation, payload and volume constraints before asking the warehouse to validate a loading plan.

Know what an estimate leaves out

We do not buy labels, track parcels or connect to carrier accounts. A weight comparison is not a price comparison. A density class is not a binding NMFC classification. A container packing result does not certify safe loading. Customs relief depends on the goods, origin, importer and declaration, not just the destination.

Source dates belong to individual entries in the source register; they are not a claim that every rate was checked today. The methodology explains formulas and assumptions. Read the publication and correction policy or report a result that disagrees with your invoice.