Know your real margin per order
Online sellers often look at revenue and miss the costs that come off every order: marketplace commission, payment processing, the share of advertising spent to win that sale, packaging and postage. These calculators add those costs in the same order a platform deducts them, so the profit you see is close to what reaches your bank.
Fees change and vary by category, country and plan. Treat the pre-filled rates as a starting point, check them against your own invoices or seller dashboard, and update them when your platform announces changes.