Marketplace seller tools

Compare one sale across every supported marketplace and rank the result by net profit.

Solve the sale price needed to cover costs, platform fees, shipping, and a target profit.

Turn sale price, costs, shipping, and platform fees into net profit and margin percentage.

Measure return on cash invested after marketplace fees, shipping costs, and item cost.

Convert lot buy cost, prep cost, and sellable units into per-item cost of goods sold.

Turn net profit and hands-on minutes into profit per hour for sourcing decisions.

Compare annual marketplace gross payments and transactions against the federal 1099-K reporting threshold.

Convert item cost and sale price into markup, margin, gross profit, and keystone targets.

Model eBay ad rate impact on promoted listing cost, total fees, and net profit.

Model the 12% or 15% Etsy Offsite Ads fee against net profit and ROI.

Estimate how many monthly orders need store fee savings before an eBay Store pays off.

Total reseller income, COGS, marketplace fees, shipping, supplies, and other expenses.

Estimate 2026 Social Security and Medicare self-employment tax from reseller net profit.

Total USPS postage, packaging, insurance, add-ons, and buyer-paid shipping impact.