Know what you really keep. Enter a transaction amount and your processor and this shows the fee and your net payout — so a price isn't quietly eaten by processing costs.
What this free tool is great for: a quick, one-off job with no signup — it runs entirely in your browser, so nothing leaves your device and there's nothing to manage.
Its honest limit: it's a one-off calculation in your browser — it doesn't save your scenarios, update as your real numbers change, or connect to your live accounts, so you re-enter the figures every time and can't watch how they move.
Every time a customer pays you by card or through an online processor, a slice of that money never reaches you — it goes to the payment processor as a fee. Individually the fees look tiny, a couple of percent here, a fixed few cents there. In aggregate, across thousands of transactions, they become one of the largest line items a business barely notices. This calculator shows you exactly what a given sale nets you after fees, and what a year of them adds up to — because the first step to controlling a cost is seeing its true size, and payment fees are experts at hiding in plain sight.
Most payment fees have two parts: a percentage of the transaction plus a small fixed amount. That structure is deliberate and it matters, because the two parts behave very differently as your transaction size changes. The percentage scales with the sale — a big order pays a big percentage fee. The fixed part doesn't move, which means on a small transaction it can dwarf the percentage. Knowing your fee is "X% plus Y fixed" rather than just "X%" is essential, because the blended rate you actually pay depends heavily on your typical order value, and the headline percentage tells only half the story.
The fixed portion of a fee is brutal on low-value sales. A fixed charge that's trivial on a large order can swallow a huge share of a small one — on a very small transaction, the fixed fee alone can be a double-digit percentage of the sale before the percentage part is even added. This is why businesses selling cheap items, running micro-transactions, or accepting tiny donations feel payment fees far more acutely than those with high order values. If your average sale is small, minimising the number of separate transactions — through bundling, minimum order values, or subscriptions — can matter more to your margin than shaving the percentage rate.
Not all processors charge the same, and the differences add up. Rates vary by processor, by card type (premium rewards cards often cost merchants more), by whether the card is present or entered online, and by your business's size and risk profile. The convenient, easy-to-integrate processors often charge a simple flat rate that's higher than what interchange-plus pricing would cost a larger merchant. There's usually a trade-off between simplicity and cost: the lowest-fee option often demands more setup and volume. Knowing your real blended rate — total fees divided by total sales — lets you judge whether you've outgrown your current processor's convenience premium.
The fees that surprise people most are the international ones. Accepting a payment in another currency, or paying out to another country, often triggers a currency-conversion fee plus a cross-border surcharge — and the exchange rate used may itself carry a hidden markup on top of the mid-market rate. Stack these together and an international transaction can cost several times what a domestic one does. For any business selling globally or paying overseas suppliers and contractors, these cross-border costs deserve as much scrutiny as the headline processing rate, because they're where a surprising amount of money silently leaks out.
Beyond the per-transaction fee sit costs that don't show up on every sale but hit hard when they do. Chargebacks — when a customer disputes a payment — often carry a fee on top of the lost sale, and too many can jeopardise your account. Refunds may not return the original processing fee. Monthly account fees, minimum charges, PCI-compliance fees and gateway fees all quietly add to the total. When you compare processors, the per-transaction rate is just the headline; the true cost includes this long tail of ancillary charges, which is where a cheap-looking headline rate can turn out to be the expensive option.
A tempting response is to add a surcharge so the customer covers the fee. Whether you can — and how — depends heavily on where you operate and the card network rules, which restrict or ban surcharging in various places and cap what you can add where it's allowed. Even where it's legal, it can dent conversion and goodwill, since customers dislike a fee appearing at checkout. Many businesses instead quietly bake the cost into their prices, spreading it across all sales rather than spotlighting it. There's no universally right answer, but it's a decision to make deliberately, with the rules in mind, rather than assuming you can simply tack the fee on.
Once you can see the cost, several levers help. Raise your average order value so the fixed fee is a smaller share. Choose a processor whose pricing model fits your volume and order size rather than defaulting to the easiest one. Reduce chargebacks with clear billing descriptors and good customer service. For international money, use providers built for cross-border payments rather than paying general processors' hefty conversion markups. None of these is a silver bullet, but together they can meaningfully lift the share of each sale you actually keep — which, on thin margins, goes straight to the bottom line.
This calculator makes the true cost of each payment visible, which is the essential first step to managing it. The harder problem, especially as you sell or hire across borders, is actually receiving and moving money internationally without the conversion markups and cross-border surcharges quietly eating your margin. That's where a platform like Payoneer does more: it's built for getting paid and paying out across countries and currencies, with the international money movement that general processors charge a premium for. Use this tool to understand what fees cost you; use a cross-border payments platform to stop the international ones from being the biggest leak of all.
Around 2.9% + a fixed fee per transaction for cards (Stripe, Square), and ~3.49% + fixed for PayPal. International and currency conversion add more.
Negotiate rates at volume, pass small fixed fees into pricing, and for cross-border payments use a service like Payoneer with lower conversion costs.
No — it calculates the processor's percentage and fixed fee. Conversion markups on international payments are extra, and often the bigger cost.
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