For anyone selling on eBay, Etsy, Shopify, Facebook Marketplace, or any other platform, the gap between “I sold it for £X” and “I actually kept £Y” is where businesses live or die. Fees stack quietly — platform commissions, payment processing, regulatory charges, advertising levies, charity contributions, and the VAT that wraps around them all. QuickCalc is a desktop profit calculator built specifically to make that gap visible, itemised, and understood before the sale is ever committed.
QuickCalc was created by CritchCorp Computers Ltd for the real-world seller who is tired of estimating. Rather than a spreadsheet that has to be rebuilt for every listing, QuickCalc keeps the fee logic in one place and lets the seller focus on the numbers that matter: net sale, total costs, profit, margin, and the all-important break-even price.
Built for the way marketplaces actually charge
Most sellers know their platform takes “a fee,” but far fewer can say exactly how much after the category final-value fee, the per-item charge, the low-order threshold penalty, the regulatory fee, and the enforced advertising percentage are all applied. QuickCalc models each of these as a configurable input, defaulting to the values for the selected marketplace, so a seller starts from a realistic baseline rather than a blank form.
The calculator separates per-order fees from per-item fees, handles VAT on fees correctly (including the distinction between VAT-registered and non-registered sellers, and the special case of Royal Mail stamps, which carry no VAT), and rolls everything into a single profit and margin figure. It also computes the break-even price — the exact sale price at which a listing stops losing money — which is the single most useful
number a seller can know before pricing.
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More than one calculator
QuickCalc is not a single screen. Alongside the main profit calculator, it bundles a set of focused mini-tools, each with its own built-in help:
– VAT Tools — add or remove VAT from any figure instantly, useful for invoices and for checking how much tax sits inside a gross price.
– Margin Calculator — work backwards from a cost and a desired markup to a sale price and the resulting margin percentage.
– Discount Calculator — see at a glance what a 5%, 10%, or 20% reduction does to a price, so a buyer’s “can you do a discount?” request can be answered with confidence.
– Free Shipping Calculator — decide whether offering free postage still leaves a profit, and how much of the margin the postage would consume.
Each tool opens as a self-contained popup with a Help button that pulls the latest guidance from the server, so the advice never goes stale.
Help that travels with the app
A recurring frustration with software is documentation that lives on a website nobody bookmarks. QuickCalc takes a different approach: its Help, its per-tool guides, its End User Licence Agreement, and a running Announcements panel are all fetched live from the update server and cached locally. Open the calculator, click Help, and the current, correct instructions appear — even the next time the app is opened offline because the last-fetched copy is kept on disk. The home screen carries an Announcements box that updates automatically, and an Introduction button that walks a first-time user through the essentials.
Updates that don’t get in the way
QuickCalc updates itself in place. When a new version is available, the home screen shows exactly what the user has installed and what they would move to, then downloads and swaps the binary cleanly. The user reopens the app and is on the new version — no installer wizard, no manual file copying, no broken shortcuts. If something ever goes wrong, a built-in recovery tool can roll the app back to any previously known-good version directly from a terminal, and the recovery list is served from the server so it always reflects reality.
A trial you can actually try
QuickCalc is offered as a free trial, so a seller can put real numbers through it before committing. The trial is fully functional; it simply asks for activation once the evaluation period ends. Because the app is a single self-contained desktop binary, getting started means downloading it and running it — no account creation required just to look.
Who it’s for
QuickCalc suits the solo eBay trader working from home, the Etsy maker pricing handmade goods, the Shopify store operator juggling ad fees, and the reseller who needs to know, in seconds, whether a £40 item at a 15% enforced ad rate is worth listing. Home sellers who don’t charge or reclaim VAT get a simplified view; business sellers get the full VAT treatment. Either way, the output is the same: a clear, defensible profit figure instead of a guess.
Available now, with more to come
The Linux version of QuickCalc is available to download today as a free trial. Windows and Mac editions are imminent and will follow the same trial model, bringing the same fee-accurate profit view to those platforms. Sellers who start on Linux now will find the experience carries straight across when their preferred platform lands.
Getting started
The fastest way to see QuickCalc in action is to download the free trial and run a sale you’ve already made through it — then compare its profit figure to what you thought you earned. For most sellers, that comparison is the moment the tool pays for itself.
Download the free trial directly from the CritchCorp website.
https://quickcalcdownload.cc-computers.com
Once installed, click Calculator, pick a marketplace, enter the fees, and press Calculate. Within seconds, you’ll see your net sale, total costs, profit, margin, and break-even price — the complete picture, every time.
