Online Seller Profit & ROI Calculator Spreadsheet – UK Marketplace Fees, Break-Even & Max Buy Price

Check if a product is worth buying before you spend. Enter buy price, sell price and fulfilment fee to see net profit, ROI, margin and break-even price. Planning aid only; fee rates are pre-filled as of 14 Oct 2026 and can change, so check the current fees in Seller Central. Not affiliated with, endorsed or sponsored by Amazon.

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General information, not financial advice.

Price includes VAT where applicable.

Refunds: if you're not happy for any reason, ask for a full refund within 14 days of purchase. If a file is faulty, we fix it, replace it or refund you. Your legal rights are not affected.

Instant download: by buying, you ask for the file to be delivered straight away and agree that you lose your 14-day right of withdrawal once the download is made available. Faulty files are still fixed, replaced or refunded.