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Amazon FBA Fee Calculator

bynexscope-ai340GitHub starsGitHub

Calculate Amazon FBA fees and profit margins automatically. Get fee breakdowns and optimization tips to maximize profits. Start free in seconds.

ecommerce
Result preview

Full Demo

Explore a real Amazon FBA profitability report powered by this Skill.

Get started

Run Your First Task

  1. amazon fba install
    01

    Install

    Add the Amazon FBA Calculator Skill to your AI agent.

  2. Chat interface screenshot titled 'Session 3775a6'. Top message (blue bubble, user input): A detailed prompt instructing an AI to act as an expert Amazon FBA Profitability Consultant. The prompt requests creation of a clear, practical FBA cost and profit analysis based on selling price, product cost, shipping cost, package dimensions, weight, category, marketplace, and storage period. Requirements include calculating size tier, chargeable weight, fulfillment fee, referral fee, storage fee, total cost, net profit, profit margin, break-even price, and ROI; identifying main cost drivers; providing three scenarios (current, conservative, optimized); labeling assumptions and missing data; reviewing calculations and refining recommendations; and exporting a professional 6-page PDF report with clean white background, tables, charts, and summaries. Page structure specified: Page 1 — Product Overview and Key Inputs; Page 2 — Size Tier and FBA Fee Breakdown; Page 3 — Profit, Margin, Break-even Price, and ROI; Page 4 — Three Profitability Scenarios; Page 5 — Packaging, Pricing, and Inventory Recommendations; Page 6 — Final Findings and Prioritized Action Plan. Final report must be accurate, easy to understand, visually polished, and suitable for Amazon sellers making sourcing, pricing, and launch decisions. Bottom message (gray bubble, AI/system response): 'Let me start by loading the FBA calculator skill and understanding what we're working with.' Bottom: text input field with placeholder 'Type a message... (Shift+Enter for new line)' and send button.
    02

    Calculate Profitability

    Enter your product dimensions, weight, selling price, costs, category, marketplace, and storage period to generate a complete FBA cost analysis.

  3. Slide titled 'PAGE 6 / FINAL DECISION: Final Findings and Prioritized Action Plan'. Subtitle: 'Calculation audit, structural weaknesses, and the actions required before sourcing or launch approval.' Four summary cards at top: 'PASS — SIZE TIER LOGIC' (light green), 'EST. — 2026 FBA FEE' (beige), '29.8% — CURRENT MARGIN' (light pink), '3 GATES — BEFORE APPROVAL' (light purple). Below: a table with four columns — Priority, Action, Acceptance standard, Owner / timing — listing 5 action items: P0 — Replace every assumption with actual ASIN and supplier data (Finance + operations / before PO); P0 — Validate the sub-16 oz packaging option (Packaging / 7 days); P0 — Set commercial guardrails (Founder + finance / pre-launch); P1 — Run inbound and storage plan (Supply chain / each PO); P1 — Review real performance monthly (Finance / monthly). Bottom left: 'Initial cost-structure weaknesses' — 4 numbered points on model dependency, ad/return volatility, unmodeled fees, and need for operational proof. Bottom right: 'Refined recommendation' — paragraph advising approval only after fee preview confirms Large Standard, prioritizing <16 oz packaging, $29.99+ price, 60-90 day inventory turn, and no PO commitment until all gates passed. Footer: Sources checked July 13, 2026 (Amazon Selling Partner Services, Seller Forums), and document identifier: 'Amazon FBA Profitability Analysis | Amazon US illustrative model | 2026-07-13'. Page number '6' at bottom right.
    03

    Optimize Performance

    Get actionable recommendations on pricing, packaging, inventory turnover, profit margin, break-even price, and ROI.

Install command

$ npx skills add https://github.com/nexscope-ai/Amazon-Skills/blob/main/amazon-fba-calculator

About

The Amazon FBA Calculator skill helps e-commerce sellers quickly analyze FBA fees and product profitability. Input your product’s dimensions, weight, selling price, and cost to receive an instant breakdown of fulfillment, storage, and referral fees, along with net margin and ROI.

It automatically detects the correct size tier using 2024 Amazon standards, from small standard to special oversize. The calculator also includes monthly and long-term storage fees, so you can spot aging inventory costs before they cut into your profits.

Use this skill to evaluate new products before listing, optimize existing inventory, or compare fulfillment strategies. Built for seller automation, it integrates with AI workflows and can process bulk JSON inputs for at-scale analysis.

Key features

What makes it powerful

  • Automatic Size Tier Detection

    Classify products into Amazon FBA size tiers instantly using 2024 standards.

  • Comprehensive Fee Breakdown

    See all FBA fees: fulfillment, monthly storage, long-term storage, and referral fees in one place.

  • Profit & ROI Analysis

    View gross margin, net margin, and ROI to make informed pricing and sourcing decisions.

  • Multi-Category Referral Fees

    Accurately calculate referral fees across different product categories like kitchen, electronics, etc.

  • Actionable Optimization Tips

    Get personalized suggestions to cut fees by reducing dimensions, weight, or excess inventory.

Use cases

When to reach for it

  • Estimate Amazon FBA fees before listing a product

    Sellers can input product dimensions and cost to see total fees and profit potential.

  • Optimize existing product profitability

    Analyze current products to find cost-saving opportunities in size, weight, or storage.

  • Compare fulfillment options

    Evaluate whether FBA or other methods yield better margins for a specific item.

  • Plan inventory storage strategies

    Understand long-term storage fees to adjust inventory levels and avoid penalties.

SKILL.md

name: amazon-fba-calculator version: 1.0.0 description: Amazon FBA Calculator - Complete fee breakdown and profit analysis platform: amazon lang: en

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)

TierMax WeightMax Dimensions
Small Standard1 lb15"×12"×0.75"
Large Standard20 lb18"×14"×8"
Small Oversize70 lb60"×30"
Medium Oversize150 lbL+Girth ≤108"
Large Oversize150 lbL+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"
}

Output

  • Size tier classification
  • Fee breakdown table
  • Profit metrics (margin, ROI)
  • Optimization suggestions

Usage

python3 scripts/calculator.py
python3 scripts/calculator.py '{"length": 10, "width": 6, ...}' --zh

Version 1.0.0 | Platform: Amazon | Variant: Lite

Part of Nexscope AI — AI tools for e-commerce sellers.

FAQ