# Marketplace Math > Free marketplace fee, seller profit, margin, and markup calculators with current formulas and transparent sources. Calculations are free, require no account, and run in the browser. Marketplace Math is an independent U.S.-focused resource for estimating marketplace fees, payment processing, net payout, profit, margin, ROI, and target sale prices. Results are informational estimates. Platform policies and the user's actual transaction statement remain authoritative. ## Calculators - [eBay Fee Calculator](https://marketplacemath.com/calculators/ebay-fee-calculator): Estimate eBay final value fees, promoted listing fees, net payout, actual profit, margin, ROI, and target sale price. - [PayPal Fee Calculator](https://marketplacemath.com/calculators/paypal-fee-calculator): Calculate current PayPal business transaction fees, net payment, profit, margin, and the price needed for a target profit. - [Etsy Fee Calculator](https://marketplacemath.com/calculators/etsy-fee-calculator): Estimate Etsy listing, transaction, payment processing, and Offsite Ads fees with net profit and target pricing. - [Whatnot Fee Calculator](https://marketplacemath.com/calculators/whatnot-fee-calculator): Estimate Whatnot commission, payment processing, payout, profit, margin, ROI, and target sale price. - [Depop Fee Calculator](https://marketplacemath.com/calculators/depop-fee-calculator): Calculate current U.S. Depop payment processing and optional boosted-listing fees with net profit and target price. - [Grailed Fee Calculator](https://marketplacemath.com/calculators/grailed-fee-calculator): Estimate Grailed's current tiered seller commission, Stripe processing, payout, profit, margin, and target price. - [Mercari Fee Calculator](https://marketplacemath.com/calculators/mercari-fee-calculator): Estimate Mercari's current U.S. selling fee, payout, profit, margin, ROI, and target sale price. - [Poshmark Fee Calculator](https://marketplacemath.com/calculators/poshmark-fee-calculator): Calculate Poshmark seller fees, net earnings, real profit, margin, ROI, and target listing price. - [Profit Margin Calculator](https://marketplacemath.com/calculators/profit-margin-calculator): Calculate gross profit, net profit, gross margin, net margin, and the revenue required for a target margin. - [Markup Calculator](https://marketplacemath.com/calculators/markup-calculator): Convert cost and markup into selling price, profit, margin, and the price needed for a target margin. ## Seller guides - [How Much Does eBay Take? Current Seller Fees Explained](https://marketplacemath.com/guides/how-much-does-ebay-take): Understand current eBay final value fees, order fees, promoted listings, category tiers, and the difference between payout and profit. - [PayPal Business Fees: What a Seller Pays Per Transaction](https://marketplacemath.com/guides/paypal-business-fees): Compare current U.S. PayPal Checkout, card, and QR transaction fees and learn how to calculate net payment and profit. - [How Much Does Etsy Take? Listing, Transaction, Payment, and Ad Fees](https://marketplacemath.com/guides/how-much-does-etsy-take): See how Etsy listing, transaction, payment processing, and Offsite Ads fees stack together for a U.S. seller. - [Whatnot Seller Fees: Commission, Processing, and Net Earnings](https://marketplacemath.com/guides/whatnot-seller-fees): Understand current Whatnot U.S. commission and payment-processing fees, their different bases, and how to estimate profit. - [Depop Seller Fees in the U.S.: Processing and Boosted Listings](https://marketplacemath.com/guides/depop-seller-fees): Calculate current U.S. Depop payment processing and boosted-listing fees after the removal of the standard selling fee. - [Grailed Seller Fees: The New 6% and 9% Commission Tiers](https://marketplacemath.com/guides/grailed-seller-fees): Understand Grailed's current under-$120 and $120-plus commission tiers, processing rates, shipping basis, and seller profit. - [Mercari Selling Fees: The Current 10% U.S. Seller Fee](https://marketplacemath.com/guides/mercari-selling-fees): Understand Mercari's current U.S. 10% selling fee, what is included in the basis, and how to move from payout to profit. - [How Much Does Poshmark Take? The $2.95 and 20% Fee Tiers](https://marketplacemath.com/guides/how-much-does-poshmark-take): Calculate Poshmark's two U.S. seller-fee tiers and understand how offers, shipping discounts, and item cost affect profit. - [How to Calculate Profit Margin: Gross, Net, and Target Margin](https://marketplacemath.com/guides/how-to-calculate-profit-margin): Learn the formulas for gross profit, gross margin, net profit, net margin, and revenue required to reach a target margin. - [Markup vs. Margin: Formulas, Examples, and Pricing Mistakes](https://marketplacemath.com/guides/markup-vs-margin): Understand the difference between markup and margin, convert between them, and set prices that cover direct and marketplace costs. ## Trust and methodology - [Methodology](https://marketplacemath.com/methodology): Sourcing, fee bases, formulas, target pricing, and testing. - [Editorial Policy](https://marketplacemath.com/editorial-policy): Primary-source, correction, AI-assistance, and commercial-independence standards. - [About](https://marketplacemath.com/about): The product's purpose and independence. ## Policies and contact - [Privacy Policy](https://marketplacemath.com/privacy): Local calculator inputs, infrastructure, email, analytics, and advertising. - [Terms of Use](https://marketplacemath.com/terms): Informational-estimate, trademark, acceptable-use, and liability terms. - [Contact](https://marketplacemath.com/contact): Fee corrections and questions: hello@marketplacemath.com. ## Optional - [Expanded machine-readable guide](https://marketplacemath.com/llms-full.txt) - [XML sitemap](https://marketplacemath.com/sitemap-index.xml)