Cost of Goods Sold Calculator
Enter a lot buy cost, prep cost, unit count, and damaged units to calculate per-item COGS before you price inventory or compare marketplace fees.
$7.50
allocated across 18 sellable units
$135.00
buy cost plus prep and supplies
18
2 excluded from the allocation
Connect inventory cost to marketplace fee data
Per-item COGS is only one side of the pricing decision. Use the Fee Index for same-input marketplace fee rows, Fee Changes for recent policy updates, and Seller Reports for dated summaries before deciding where inventory has enough room after fees.
Once the cost basis is set here, the data assets help compare whether the same item still has a viable margin on each marketplace.
Turn this result into a listing decision
Use the tool result as a starting point, then test payout, break-even price, shipping, and marketplace fit before you publish the listing.
Why COGS changes pricing
Lot buys often look cheaper than they are because damaged units, prep supplies, and cleaning time get ignored. Allocating those costs across only the sellable units gives each item a more honest starting cost.
Use per-item COGS before running the fee calculators. If the cost basis is wrong, every marketplace profit estimate will be wrong too.
Related tools
After assigning COGS, use margin and ROI to decide whether the buy is repeatable, then compare payout across marketplaces before listing.