Shipping Overpay Calculator Methodology
Compares current average package cost with a zone-and-weight benchmark to estimate monthly and annual overpay or savings.
Amazon FBA is active. Other marketplace modules stay marked as planned until audited.
Compares current average package cost with a zone-and-weight benchmark to estimate monthly and annual overpay or savings.
Fee schedule/source date: carrier benchmark model reviewed 2026-05-08; use your negotiated rate card before acting.
Primary source register: Amazon fee schedules · Amazon Revenue Calculator.
Formula
monthly_overpay = monthly_packages × (current_cost_per_package - benchmark_cost_by_zone_and_weight)
Includes
- Monthly package volume
- Average package weight
- Average zone
- Current cost per package
- Benchmark rate by zone/weight
Excludes
- Dimensional-weight exceptions
- Residential and delivery-area surcharges
- Fuel surcharge by carrier
- Returns labels
- International shipping
- 3PL pick/pack fees
2026 fee-category audit
| Fee component | Status |
|---|---|
| Fuel and inflation surcharge | explicitly excluded |
| Multi-Channel Fulfillment fee differential | explicitly excluded |
Diagnostic output: Margin status, per-package overpay, annualized impact, and sensitivity to a $1/package cost change.
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