# Amazon FBA Fee Calculator

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

- Canonical: https://nanoskill.ai/skills/amazon-fba-fee-calculator-c218
- Markdown: https://nanoskill.ai/skills/amazon-fba-fee-calculator-c218.md
- Author: nexscope-ai
- Published: 2026-07-13T04:09:11.103Z
- Updated: 2026-07-15T13:35:52.251Z
- Language: en
- Source type: github
- Popularity signal: 340

## Sources

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

## Install

```shell
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

- **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

- **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.

## Result preview

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

![Slide titled 'PAGE 1 / PRODUCT OVERVIEW: Product Overview and Key Inputs'. Subtitle: 'Illustrative premium insulated bottle - all missing business inputs are clearly labeled for replacement.' Left side features abstract geometric illustration in shades of green, pink, and purple with white text 'FBA PROFITABILITY PATH'. Right side contains a table with three columns: 'Input', 'Assumed value', and 'Status / required validation'. Rows list: Marketplace (Amazon US — replace if selling in CA, UK, EU, JP, or AU), Category (Home & Kitchen — assumed 15% referral rate), Selling price ($29.99 — current price assumption), Product cost ($6.30/unit — supplier cost; excludes inbound shipping), Inbound shipping ($0.90/unit — factory to FBA network assumption), Packaged dimensions (10.0 x 3.1 x 3.1 in — use Amazon measured dimensions), Unit weight (1.00 lb / 16 oz — use packaged scale weight), Storage period (90 days — assumed Jan-Sep non-peak period), Advertising allowance (12% of sales — optional but included for realistic profit). Bottom section displays four rounded rectangular cards: '$29.99 SELLING PRICE' (light green), '1.00 lb CHARGEABLE WEIGHT' (beige), '90 days STORAGE PERIOD' (light pink), '15% REFERRAL RATE' (light purple). Below table: Assumption warning text noting no ASIN, supplier quote, actual fee preview, return history, or advertising report was supplied; states this page defines the working model and page 6 lists validation steps required before sourcing or launch approval.](https://file.nanoskill.ai/amazon-fba-outcome1.png)

![amazon fba outcome2](https://file.nanoskill.ai/amazon-fba-outcome2.png)

![amazon fba outcome3](https://file.nanoskill.ai/amazon-fba-outcome3.png)

![amazon fba outcome4](https://file.nanoskill.ai/amazon-fba-outcome4.png)

## Result walkthrough

### Install

Add the Amazon FBA Calculator Skill to your AI agent.

![amazon fba install](https://file.nanoskill.ai/amazon-fba-install.png)

### Calculate Profitability

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

![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.](https://file.nanoskill.ai/amazon-fba-task.png)

### Optimize Performance

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

![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.](https://file.nanoskill.ai/amazon-fba-outcome.png)

## Skill definition

---
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)

| 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

```json
{
  "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

```bash
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](https://www.nexscope.ai/?co-from=skill) — AI tools for e-commerce sellers.**

## FAQ

### What is the Amazon FBA calculator?

It's a tool that calculates Amazon FBA fees based on product dimensions, weight, and category, providing a full profit analysis.

### How does the FBA fee breakdown work?

The calculator uses official Amazon 2024 rates to compute fulfillment, storage, referral fees, and returns net margin.

### Does it support all Amazon product categories?

It includes referral fees by category; check the skill for the full list of supported categories.

### Is there a free version?

Yes, the Lite version is free and open-source, with no hidden costs.

### Can I use it for oversized products?

Yes, the calculator classifies items from small standard to special oversize and applies the correct fees.

### How do I get optimization suggestions?

After inputting your product details, the tool provides tips on reducing size, weight, and storage costs based on your specific numbers.