Educational estimates
ShopMathLab provides estimates for planning and education, not accounting, investment, tax or legal advice. Actual results depend on your inputs, business circumstances and applicable rules.
Marketplace fees can change
eBay, Etsy, Amazon and Shopify can vary fees by product, seller account, country, payment method and service. Check the fee-source log and current official terms. Editable defaults do not cover every exception.
Amazon fulfillment
FBA charges vary by dimensions, weight, category, storage duration, inventory placement and optional services. Enter product-specific fulfillment estimates from Amazon rather than assuming a generic rate is a quotation.
Taxes and currencies
The marketplace calculators target US fee schedules and USD. Other calculators offer display currencies without converting amounts or applying country-specific tax rules. Recoverable taxes, business income taxes and customs classification require separate analysis.