Methodology
Methodology
This page explains how the calculators work, when they calculate automatically, and when they deliberately avoid guessing.
Last updated: 2026-06-17
When the calculator can calculate automatically
SellerMaths uses an automatic result only when the PayPal rule is clear enough to apply safely. If PayPal does not publish enough detail for a country, currency or product, the calculator asks for manual input, hides that option, or shows a warning instead of guessing.
Main PayPal fee calculator
The standard seller-fee estimate uses the common percentage-plus-fixed-fee structure.
fee = gross_amount × percentage_rate + fixed_fee[currency]net_received = gross_amount − feeeffective_rate = fee ÷ gross_amountgross_to_charge = (target_net + fixed_fee) ÷ (1 − percentage_rate)for reverse mode.
Goods & Services / G&S, card, and QR methods are shown only for countries where the local PayPal fee information supports that method.
International PayPal fee calculator
The international page is for cross-border PayPal fees, not exchange-rate math. It asks for the sender country, recipient country, currency, payment type, and funding context. It has two modes: Business receiving / Goods & Services and Personal send / PayPal-to-PayPal transfer. Currency conversion belongs on the exchange-rate calculator.
Business receiving mode
This mode estimates the seller-side fee for an international Goods & Services or business payment. The recipient/seller country selects the merchant fee table and the selected payment currency selects the fixed fee.
business_fee = payment_amount × (domestic_business_rate + international_add_on_or_total_rate) + fixed_fee[payment_currency]
net_received = payment_amount − business_fee
Personal send mode
This mode estimates sender-side PayPal-to-PayPal transfer fees only where the sender-country consumer fee page gives enough information. The sender country chooses the fee rule, and the currency chooses the applicable minimum, maximum, or flat fee.
personal_send_fee = amount × personal_international_percentage, then apply any published minimum and maximum cap for that currency.
card_funding_fee = amount × card_percentage + card_fixed_fee[payment_currency] when a verified card-funded personal-send rule exists.
sender_total = amount + personal_send_fee + card_funding_fee
The international calculator keeps fees separate from currency conversion. If a required fixed fee or send-money rule is missing, it shows a warning instead of using US fees or pretending the fixed fee is zero.
Invoice fee and profit calculator
The invoice page uses a separate invoice rate where PayPal publishes one. In countries where PayPal does not publish a distinct invoice row, the page clearly labels the result as an invoice/business receiving estimate.
invoice_fee = invoice_amount × invoice_rate + fixed_fee[currency]net_after_paypal = invoice_amount − invoice_feetotal_costs = product_cost + shipping + packaging + handling + tax_amount + other_costsprofit = net_after_paypal − total_costsmargin = profit ÷ invoice_amount
Exchange rate calculator
The exchange-rate calculator compares market conversion with either a manually entered PayPal checkout rate or an editable PayPal spread estimate.
market_converted = source_amount × market_rateestimated_paypal_rate = market_rate × (1 − paypal_spread)paypal_converted = source_amount × paypal_rateconversion_loss = market_converted − paypal_converted
Manual PayPal rate mode is best when you can copy the exact rate PayPal shows at checkout or in Wallet.
Instant transfer / withdrawal calculator
For automatic instant-transfer methods, the calculator uses percentage fees with minimum and maximum caps where those caps are present.
fee = min(max(balance × percentage, minimum_fee), maximum_fee)net_to_bank_or_card = balance − fee
Automatic withdrawal methods are shown only when the country and method have a clear PayPal fee rule. For anything else, manual fee input is safer than borrowing another country’s tariff.
Pay Later calculator
Pay in 4, Pay in 3, Pay after 30 days, Pay Monthly and local installments are not the same product. The calculator separates zero-interest installment schedules from APR-based monthly credit schedules.
payment = purchase_amount ÷ number_of_paymentsfor 0% installment products.monthly_rate = APR ÷ 12monthly_payment = principal × monthly_rate ÷ (1 − (1 + monthly_rate)^(-months))for monthly APR products.
APR mode is used only where the product is actually an APR/monthly credit product, not for Pay in 4 or Pay in 3.
Tax calculator
The tax calculator uses the tax rate you enter. It does not choose VAT, GST, sales tax, state tax, or marketplace tax rates for you.
tax_amount = amount_before_tax × user_tax_rategross_with_tax = amount_before_tax + tax_amountpaypal_fee = selected_fee_base × PayPal_rate + fixed_fee[currency]
Donation and charity calculator
The donation calculator uses a local donation row where PayPal publishes one. If no separate donation row is available, it labels the result as a commercial-rate donation estimate. Discounted charity/nonprofit mode appears only where PayPal publishes a supported charity rate.
standard_donation_fee = donation_amount × donation_percentage + fixed_fee[currency]approved_charity_fee = donation_amount × charity_percentage + charity_fixed_fee[currency]international_donation_fee = donation_amount × (domestic_donation_percentage + international_addon) + fixed_fee[currency]
FAQ
Why can results differ from PayPal checkout?
Country, account status, payment method, currency conversion, funding source, product availability, card issuer and PayPal policy changes can affect the final amount.
Why are some modes hidden?
A mode is hidden when the local PayPal fee page does not give enough information or the product is not available in that country.
Why does the tax calculator require manual tax input?
Tax depends on jurisdiction, product type, seller status and marketplace rules. The site does not include a tax-rate database, so the user enters the tax rate manually.