Payment Processor Fee Calculators
Card processors typically charge a percent plus a fixed fee. On $100, Stripe US is $3.20 (2.9% + $0.30); PayPal US G&S is $2.99 (2.99%); Square Free online is $3.60 (3.3% + $0.30). Start with the calculator that matches your checkout, then compare with our guides.
Stripe Fee Calculator
Free Stripe fee calculator: see the 2.9% + 30¢ fee and your net payout, or work backward to the price to charge. Covers US, UK, EU, Connect and Invoicing.
PayPal Fee Calculator
Calculate PayPal Goods & Services, Friends & Family and international fees. See what you keep, or find how much to invoice to receive an exact amount.
Square Fee Calculator
Calculate Square payment fees for online, in-person, keyed entry, UK and Australia. Forward fee math and reverse pricing to receive a target net amount.
Shopify Payments Fee Calculator
Compare Shopify Payments online rates for Basic, Shopify and Advanced plans, plus third-party gateway fees. Forward and reverse fee math.
Which tool do I need?
| Processor | Default schedule | Fee on $100 | Calculator |
|---|---|---|---|
| Stripe | US domestic cards: 2.90% + 0.30 | $3.20 | Open |
| PayPal | US Goods & Services (Send/Receive Money): 2.99% + 0.00 | $2.99 | Open |
| Square | US Free plan – online / invoice: 3.30% + 0.30 | $3.60 | Open |
| Shopify Payments | Basic plan – online: 2.90% + 0.30 | $3.20 | Open |
How to choose a processor calculator
Start with the brand on your checkout or invoice. Stripe fits custom web checkouts and Connect platforms; PayPal fits buyer wallets and Send/Receive Money for Goods & Services; Square fits POS plus online invoices; Shopify Payments fits Shopify storefronts where plan tier changes the card rate. Run the same dollar amount through two tools before you migrate — online vs in-person schedules often differ by more than 0.5 percentage points.
International cards, currency conversion, and keyed-entry surcharges stack on top of domestic online rates. Each calculator lists dated regional schedules with official source URLs. For side-by-side tables at fixed ticket sizes, open the $100 fee example or the interactive comparison.