Most FBA calculators ignore prep, inbound placement and freight, so your margin looks better than it is. FBA Calcs shows your true landed cost per unit and real net profit — free, no sign-up. • Profit and fee calculator: referral tiers, FBA size tiers, inbound placement, prep, freight • Prep cost calculator: polybagging, labelling, bundling, inspection per unit • Sourcing scorecard: margin, competition, seasonality before you commit 2026 US rate card, 10 marketplaces, 4 languages.