About these tools
All rates are the published 2026 seller-side fees (Fee data by SellersCalc (CC BY 4.0)), and every calculation runs in your browser. Estimates only — verify against each platform's official fee page before deciding where to sell.
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Payment Processors — Fee Calculators
Payment processors quote simple rates like 2.9% + $0.30, but the effective rate depends entirely on ticket size: the flat portion can double the cost of small transactions. These calculators show the real percentage at your price point.
PayPal Fee CalculatorCalculate PayPal commercial transaction fees: 3.49% + $0.49 for standa…Stripe Fee CalculatorCalculate Stripe fees: 2.9% + $0.30 per successful card charge. Model …Square Fee CalculatorCalculate Square processing fees for online and in-person sales: 2.9% …Shopify Payments Fee CalculatorCalculate Shopify Payments fees by plan: 2.9% + $0.30 on Basic down to…