You sold an item for £40. That is what the listing said, and that is what the customer paid. But how much did you actually keep? Between the platform commission, payment processing, regulatory charges, enforced ad levies and VAT on fees, the number that matters is rarely the number on the listing. Quick Calc Marketplaces for Linux models every one of those costs and shows you the figure that decides whether to list the item at all — your net profit. Quickcalc Buy from the online shop
Quickcalc Quickcalc Quickcalc Quickcalc
It is a desktop application for Linux that runs offline, installs in seconds, and gives you a 30-day free trial with no account to create. A one-time licence replaces the spreadsheet you have been rebuilding for every listing.
The fees most sellers cannot easily track — in one place
Most sellers know their marketplace takes “a fee”. Fewer can say exactly how much they take once every charge is applied. Quick Calc models the fee types that matter: the final-value or commission percentage each marketplace takes on a sale; regulatory fees such as eBay’s compliance charge; VAT on fees, handled correctly with a simplified view for home sellers; fixed order and per-item fees — the flat charges added per order or per item; enforced ad fees, the fixed advertising percentage you cannot opt out of on platforms like Etsy; charity donations and top-rated or seller discounts; low-order threshold penalties charged when an order falls below a set value; category fees for higher-rate categories like electronics or watches; and foreign-sale fees for orders shipped internationally.
That is 15 fee types modelled in one place, per marketplace.
Ten marketplaces built in
Quick Calc loads default fee values for each marketplace — eBay, Etsy, Shopify, Facebook Marketplace and more — so you start from a realistic baseline rather than a blank form. You can edit those defaults to match your actual account, because the rates your account sees are not always the rates the help page quotes.
The numbers that decide whether to list
Press Calculate and Quick Calc rolls every cost into the numbers that matter: your net sale, total costs, profit, margin, and the exact break-even price — the price at which the item stops losing money. The break-even price is the single most useful number a seller can have before listing. It tells you the floor below which you should not sell, before you have committed to a listing that loses money.
Alongside the main calculator, focused mini-tools answer the what-if questions sellers face every day: a VAT tool to add or remove VAT on any figure; a margin calculator to work from a cost and desired markup to a sale price and margin; a discount calculator to see instantly what 5%, 10% or 20% off does to a price; and a free shipping calculator to decide whether free postage still leaves a profit.
Why a spreadsheet is not the answer
A spreadsheet rebuilt for every listing misses fee logic that changes between marketplaces, gets VAT on fees wrong more often than not, does not compute break-even automatically, stays static and out of date when marketplaces change their rates, and offers no built-in tools for the what-if questions. Quick Calc keeps the logic in one place, handles VAT on fees correctly, computes break-even automatically, notifies you of updates, and includes live help and built-in tools for recovery.
Quick Calc Marketplaces for Linux is a product of CritchCorp Computers Ltd. The free 30-day trial is fully functional — continued use after the trial requires a licence. Fee and profit figures are estimates based on the values you enter and the rates available at the time; marketplaces change their fees, and actual results vary. Always confirm final charges with your marketplace.
