Inventory cost
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.
Inventory lot
COGS result
Per-item COGS
$7.50
allocated across 18 sellable units
Total COGS
$135.00
buy cost plus prep and supplies
Sellable units
18
2 excluded from the allocation
Pricing checkpoints before fees
2x COGS
$15.00
3x COGS
$22.50
4x COGS
$30.00
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.