Free tools
Calculators for resellers
The arithmetic from the reselling course, in a form you can run against your own numbers. No sign-up, and nothing is stored.
None of these prefill a marketplace's fee rate. Published rates change, vary by category and country, and sellers price against them — so a stale prefilled number would be worse than no number at all. Take your rates from your own most recent payout statement.
Bid Ceiling Calculator
Work backwards from a realistic sold price to the most you can pay for an item and still make the profit you decided on.
Explained in: Valuing inventory before you buy it
Profit Margin Calculator
Model true margin on a sale once item cost, shipping, fees, packaging, and operating costs are all accounted for.
Explained in: Pricing strategy for resellers
eBay Fee Calculator
Estimate the deductions on an eBay sale and the payout that actually reaches you, using your own fee rates.
Explained in: Marketplace fees explained
Discogs Fee Calculator
Estimate Discogs and payment-processing deductions so record pricing starts from net proceeds rather than the sticker.
Explained in: Marketplace fees explained