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Calculate exact OnBuy profit margins, fees & ROI. Lookup by EAN/OPC/URL. Built for UK dropshippers and resellers. # OnBuy Profit Calculator — Chrome Web Store Listing ## Title (max 75 characters) OnBuy Profit Calculator — Fee & Margin Calculator for Sellers ## Short Description (max 132 characters — shows in search results) Calculate exact OnBuy profit margins, fees & ROI instantly. Built for UK dropshippers & resellers. Free & private. ## Detailed Description (shows on listing page) Stop guessing your margins. OnBuy Profit Calculator gives UK sellers an instant breakdown of profit, ROI, and margin — using OnBuy's published fee categories and VAT-on-fee structure. WHY SELLERS USE THIS Whether you're dropshipping, reselling, or running a white-label brand on OnBuy, knowing your real profit before you list a product saves you from costly mistakes. This calculator does the maths for you in seconds — including looking up a product directly from its OnBuy page. KEY FEATURES ✓ Look Up Any OnBuy Product Paste an EAN, OPC code, or OnBuy product link — or simply open the calculator while viewing a product page and it auto-fills the sell price and category for you. ✓ OnBuy Fee Categories Built-in category fees — Standard (15%), Consumer Electronics (7%), Large Appliances (7%), Games Consoles (8%), Beer/Wine/Spirits (10%), Tools & DIY (13%), Jewellery (20%) ✓ VAT-on-Fee Calculation If you're VAT registered, the calculator correctly adds 20% VAT on top of OnBuy's commission — verified against real OnBuy seller order data. ✓ Instant Results See your Net Profit, ROI %, and Margin % the moment you enter your source price, with a clear Good / Normal / Low / Loss verdict. ✓ Fee Guide Reference Tap any category in the built-in Fee Guide to instantly load that rate into your calculation. ✓ Calculation History Your last 20 calculations are saved automatically — click any past entry to reload and adjust. ✓ 100% Private No accounts, no sign-ups. Calculation history is stored locally in your browser. The lookup feature reads OnBuy product pages only when you choose to use it. WHO IT'S FOR — OnBuy dropshippers sourcing from Amazon, eBay, or AliExpress — Resellers calculating margins before listing — Anyone running a multi-channel UK e-commerce business IMPORTANT NOTE This calculator provides estimates based on OnBuy's published fee categories. Category detection from a product page is automated and may occasionally not match the exact fee OnBuy charges for that specific listing — always check the "Sales Fee" on your OnBuy Seller Central listing page to confirm before relying on these numbers for business decisions. No fluff, no ads, no tracking — just a fast calculator built specifically for OnBuy's fee structure. --- ## Category Productivity ## Language English (United Kingdom) ## Privacy Policy URL [Insert your hosted privacy policy URL here] ## Permission Justification (for submission form) **storage**: "Used solely to save the user's calculation history and current draft locally on their device using chrome.storage.local. No data is transmitted anywhere." **tabs, scripting, host_permissions (onbuy.com, google.com)**: "Used to read publicly visible product details (price, category, title) from an OnBuy product page when the user pastes an EAN/OPC/URL to look up a product, or when the user opens the extension while already viewing an OnBuy product page. A Google site-search is used as a fallback only when OnBuy's own search does not find a match for the entered code. No personal browsing data is collected or transmitted." --- ## Screenshot Plan (1280x800 or 640x400 — need 1 to 5) 1. **Calculator tab** — filled in with example numbers, showing the results card (Net Profit, ROI, Margin, verdict) 2. **Lookup in action** — showing the "Product found" card after pasting a URL 3. **Fee Guide tab** — showing all OnBuy categories with their fee percentages 4. **History tab** — showing a few saved calculations ### How to capture screenshots: 1. Load the extension in Chrome (chrome://extensions → Load unpacked) 2. Click the extension icon to open the popup 3. Fill in example values (e.g. Sell £29.99, Source £12.00, Category: Standard 15%) 4. Click Calculate 5. Use Windows Snipping Tool (Win+Shift+S) to capture just the popup window 6. Resize/pad the image to exactly 1280x800 px (use any free tool like https://www.iloveimg.com/resize-image) --- ## Promo Tile (optional, 440x280 PNG) Not required for first submission — can be added later for featured placement consideration.