Amazon Fba Calculator

This calculates Amazon FBA fees and profit margins based on product dimensions, weight, and pricing. It automatically classifies items into the correct 2024 size tier (small standard through special oversize), breaks down fulfillment fees, storage costs, and referral fees by category, then shows you gross margin, net margin, and ROI. The optimization tips are helpful if you're trying to shave costs by tweaking packaging dimensions or managing inventory aging. It's straightforward if you're sourcing products and need to know whether the unit economics actually work before committing to inventory. Supports both JSON input and interactive mode, with Chinese language output available.

skills.sh installs: 1.3K
GitHub stars: 855
last updated: Aug 21, 2026

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Install

$ npx -y skills add nexscope-ai/amazon-skills --skill amazon-fba-calculator --agent claude-code

Installs into .claude/skills of the current project.

Files

Amazon FBA Calculator (Lite)

Precise FBA fee calculation based on product dimensions and weight.

Features

Size Tier Detection - Automatic classification
FBA Fulfillment Fee - 2024 rates
Monthly Storage Fee - Standard & Peak season
Long-term Storage Fee - 271+ days aging
Referral Fee - By category
Profit Analysis - Gross/Net margin, ROI
Optimization Tips - Size, weight, inventory

Size Tiers (2024)

Tier	Max Weight	Max Dimensions
Small Standard	1 lb	15"×12"×0.75"
Large Standard	20 lb	18"×14"×8"
Small Oversize	70 lb	60"×30"
Medium Oversize	150 lb	L+Girth ≤108"
Large Oversize	150 lb	L+Girth ≤165"
Special Oversize	>150 lb	>165"

Input

{
  "length": 10.0,
  "width": 6.0,
  "height": 3.0,
  "weight": 1.2,
  "selling_price": 29.99,
  "product_cost": 8.00,
  "inbound_shipping_cost": 1.50,
  "category": "kitchen"
}