Know your real margin before you ship.
MarginSum helps independent and cross-border sellers add up product cost, freight, duty, VAT, platform and payment fees, ads and returns — so you see true profit per unit.
Profit & landed cost
Amazon US referral fees by category, Shopify plans and Shopify Payments, WooCommerce with Stripe or PayPal. Net profit, margin, ROI and break-even price.
Calculate →Shopify vs WooCommerce
A sourced cost breakdown, pros and cons, and who should choose which.
Compare →Sourced, dated fees
Every built-in fee links to the official page and shows when we last checked it. Anything we couldn't verify stays editable.
How we source data →