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Compare net profit across eBay, Etsy, Facebook Marketplace, Mercari, Poshmark, and Amazon after all fees. FlipCalc (Reseller Profit Calculator) instantly compares your real take-home profit across major marketplaces after fees. Enter: • Cost of goods • Selling price • Shipping cost • Choose whether buyer or seller pays shipping Then FlipCalc shows results for: • eBay • Etsy • Facebook Marketplace • Mercari • Poshmark • Amazon PLUS add your own platform with your own fees What you get (per platform): • Net Profit (and highlights the best option) • Total Fees • Profit Margin % • ROI % • Net Revenue • Tap to expand a full fee-by-fee breakdown Sort results by: • Highest Profit • Highest Margin • Highest ROI • Lowest Fees Custom fee settings You can edit platform fee values in Settings and turn platforms on/off to match your seller accounts and scenarios (promoted listings, flat fees, thresholds, processing fees, FBA, and more). Privacy No accounts. No tracking. No network calls. Your inputs and fee settings stay in your browser (stored via Chrome storage). Disclaimer Marketplace fees and policies can change. FlipCalc provides estimates—always confirm final fees inside the platform before listing.
Feb 25, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.