Financial Calculators
for Resellers

Calculate Poshmark fees and seller proceeds, compare eBay managed-payment profit with PayPal direct-sale fees, and audit payouts across major resale marketplaces.

Model Shopify contribution per order and a repeat-order monthly sensitivity after payment fees, plan and app overhead, COGS, fulfillment, marketing, discounts, and returns.

Calculate capital, storage, service, and risk costs, then test whether an unsold item earns enough extra net value to justify more holding time.

Calculate a gold jewelry metal floor and compare buyer offers after karat, known non-gold weight, a user-entered dated spot price, and buyer spread.

Calculate sterling silver scrap value from weight, purity, a current quote, and refiner payout, then compare that floor with resale net.

Score supplier evidence, record a sample-lot assay, and solve a wholesale 925 jewelry buy ceiling after landed cost, defects, sell-through, fees, labor, and downside risk.

Compare StockX Listings or Verified Marketplace payout against GOAT rating-based commission, seller fee, cash-out fee, buy cost, and issue reserve before listing sneakers.

Work out the PayPal Goods and Services fee on any amount and what you receive. US rates for G&S, Checkout, Venmo, card and QR, plus the G&S rates for sellers in the UK, Australia, Canada and Germany, all from PayPal's own fee pages (checked Oct 19, 2026).

Calculate the minimum resale price that covers buy cost, seller-paid shipping, supplies, risk reserve, platform fees, labor value, and offer buffer across eBay, Mercari, Poshmark, Depop, Facebook local and shipped checkout, Whatnot, Etsy, and Vinted.

Estimate Amazon FBA monthly storage, aged-inventory surcharge exposure, removal break-even, and sell-through risk before sending inventory.

Work out your Depop payout for a single sale or a bundle, with your region, shipping, sales tax, Boost and break-even price.

Calculate reseller credit card rewards after platform fees, interest, annual-fee allocation, redemption value, and resale profit.

Model eBay Promoted Listings General ad fees on total sale amount, then calculate per-sale profit, break-even view lift, and max safe ad rate.

Estimate taxable income after COGS, platform fees, shipping, and supplies. See federal income tax and self-employment tax before quarterly payments, with the 2026 brackets, standard deduction and QBI deduction for single or joint filers.

Calculate true retail arbitrage buy cost after sales, coupons, sales tax, cashback, card rewards, rebates, quantity, and resale fees. Use the effective COGS and decision panel before buying.

Convert margin, markup, and pricing multipliers, then test whether marketplace fees, fixed fees, and seller-paid shipping still leave the target net margin.

Calculate reseller ROI after platform fees, buyer shipping, seller shipping, packing, reserve, labor, hourly target, days to sell, and target buy price. See the decision before sourcing.

Estimate reseller inventory COGS after discounts, average state sales tax, exact rate overrides, resale certificate status, and purchase-use guardrails.

Calculate net profit, ROI, margin, break-even price, and target sale price after marketplace fees, shipping, reserves, and labor.

Calculate Whatnot commission by category and sales tier, processing, seller-covered shipping discounts, net profit, and live-auction floor price before a show.

Decide whether to accept, counter, or wait on a reseller offer after fees, shipping, holding time, target profit, and ROI floor.

Compare current sold comps, trade-in offers, platform fees, battery health, lock status, accessories, and condition before listing used electronics.

Model liquidation pallet profit after manifest risk, freight, buyer premium, storage, platform fees, shipping, labor, and target hourly return.

Shortlist PSA, BGS, SGC, or CGC by live tier constraints, then compare exact graded sold comps with the raw-card exit and all-in grading cost.

Model return rate, damaged returns, shipping loss, fees, and restock value to see how returns change reseller profit before you price inventory.

Set your eBay Best Offer auto-accept, decline, and counter thresholds with fee-basis math for resellers.

Calculate reseller tax savings with IRS 2026 split-year rates: 72.5¢ Jan-Jun and 76¢ Jul-Dec. Track sourcing and shipping trips.

Calculate whether an inventory storage unit pays for itself using rent, inventory value, sell-through, margin, insurance, and access costs.

Compare eBay vs Mercari with fee math and item-category routing, then rank net profit across eight marketplaces using the same sale, shipping, cost, and target-profit inputs.

Decide whether to run an eBay auction or fixed-price listing by comparing expected profit, low-close risk, reserve cost, fee basis, and time cost.

Find the bundle discount that clears your target profit after platform fees, shipping savings, item costs, return-risk reserve, and sell-through probability.

Use COGS, average inventory, unit movement, stale stock, revenue, and storage cost to decide whether to keep sourcing, reprice, or clear inventory.

Allocate purchase price, inbound shipping, tax, repairs, and supplies across mixed resale inventory, then export a traceable per-item cost basis.

Plan USPS zone risk before listing by combining regional zone estimate, official zone override, postage quote, package dimensions, platform fee, and target profit.

Use current sold comps, platform fees, seller shipping, prep cost, condition, and target cost per wear to decide whether to wear, list, or pass on a resale-recovery buy.

Calculate reorder points, safety stock, MOQ exposure, budget risk, and one-off inventory guardrails before restocking resale inventory.

Build a controlled listing-time test for eBay, Poshmark, Mercari, Depop, Whatnot, and Facebook using category fit, platform mechanics, batch size, and measured first-24-hour results.

Calculate a cost-and-ROI price floor, target close price, live accept/counter/decline decision, and editable buyer response script with optional fee-basis add-on before replying to an offer.

Estimate condition-adjusted resale price, repair ROI, net payout, and disclosure copy from clean sold comps, category, packaging, defects, fees, and return reserve.