FBA Profit Calculator Methodology
Estimates per-unit FBA profit after unit cost, referral fee, closing fee where applicable, simplified fulfillment fee, and blended storage multiplied by per-product months on hand.
Amazon FBA is active. Other marketplace modules stay marked as planned until audited.
Estimates per-unit FBA profit after unit cost, referral fee, closing fee where applicable, simplified fulfillment fee, and blended storage multiplied by per-product months on hand.
Fee basis: 2024 published FBA rate-card midpoints; 2026 fee-change scope reviewed 2026-05-08. Known 2026 surcharges and program-specific fees are excluded unless explicitly modeled.
Primary source register: Amazon fee schedules · Amazon Revenue Calculator.
Formula
net_profit = selling_price - product_cost - referral_fee - closing_fee - fulfillment_fee - (storage_fee_monthly × months_on_hand)
Includes
- Referral-fee percentage with $0.30 minimum
- Media closing fee where applicable
- Simplified FBA fulfillment-fee tier
- Blended monthly storage estimate
- Per-product months-on-hand storage residence
- Per-unit net margin classification
Excludes
- Inbound Placement Service Fee unless you add it to product cost
- Low-Inventory-Level Fee
- Aged inventory surcharge beyond the storage estimate
- Returns Processing Fee
- Fuel/inflation surcharge
- PPC/ACoS
- Coupons and promos
- Sales tax/VAT
- Multi-Channel Fulfillment
2026 fee-category audit
| Fee component | Status |
|---|---|
| 2026 baseline FBA fulfillment-fee schedule | included or not applicable |
| Q4 storage seasonal spike | included in inventory storage assumptions |
| Inbound Placement Service Fee | explicitly excluded unless user enters |
| Low-Inventory-Level Fee | explicitly excluded |
| Aged Inventory Surcharge | explicitly excluded |
| Returns Processing Fee | modeled in return cost planning |
| Fuel and inflation surcharge | explicitly excluded |
| PPC / ACoS impact | modeled in break even ad spend |
| Coupons and promotional discounts | explicitly excluded unless user enters |
| Sales tax / VAT pass-through math | explicitly excluded |
| Multi-Channel Fulfillment fee differential | explicitly excluded |
Diagnostic output: Margin status, largest fee component, approximate price floor, max COGS, implied max ACoS before the unit turns negative, and the explicit distinction that FBA months-on-hand is per-product storage residence while aggregate turn rate belongs in the Inventory Carrying Cost calculator.
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