# Amazon FBA Calculator Skill

> Calculate precise Amazon FBA fees, including fulfillment, storage, and referral costs, and get a full profit breakdown with margin and ROI. Start free in seconds.

- Canonical: https://nanoskill.ai/skills/amazon-fba-calculator-skill
- Markdown: https://nanoskill.ai/skills/amazon-fba-calculator-skill.md
- Author: nexscope-ai
- Published: 2026-07-13T04:09:11.104Z
- Updated: 2026-08-06T07:06:38.505Z
- Language: en
- Source type: github
- Popularity signal: 339

## 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

Amazon FBA calculator tools help e-commerce sellers estimate the true costs of selling on Amazon. This skill accurately calculates all relevant FBA fees—from fulfillment to storage—so you can analyze profit margins before listing a product or optimize your existing catalog. Whether you're a new seller scouting products or a veteran expanding your inventory, you'll get a detailed fee breakdown and actionable insights in seconds.

Beyond standard fee calculation, this skill automatically detects your product's size tier, applies the latest 2024 rate cards, and breaks down fees line by line. It also computes gross and net margins, ROI, and even suggests optimization tips like reducing package dimensions or adjusting inventory months to cut long-term storage costs.

Use it to compare FBA versus FBM economics, forecast seasonal storage spikes, or bulk-analyze your entire product line. With a simple JSON input, you can integrate it into your sourcing workflow or run ad-hoc analyses with plain Python scripts.

## Key features

- **Automatic Size Tier Classification**: Instantly classify your product into the correct Amazon size tier based on dimensions and weight, ensuring accurate fee calculations.
- **Complete FBA Fee Breakdown**: Get a detailed breakdown of fulfillment fees, monthly storage, long-term storage, and referral fees using the latest 2024 rates.
- **Profit & ROI Analysis**: Calculate gross margin, net margin, and ROI after all FBA costs, including inbound shipping, to see your true bottom line.
- **Actionable Optimization Tips**: Receive smart suggestions to reduce fees by adjusting product size, weight, or inventory management strategies.

## Use cases

- **Estimate profitability for new products**: Before sourcing, quickly calculate all Amazon FBA fees and project your net profit to decide if a product is worth selling.
- **Optimize existing inventory costs**: Analyze your current catalog to identify products with high storage or oversized fees and take action to reduce costs.
- **Compare FBA vs FBM scenarios**: Understand the fee differences between Fulfilled by Amazon and Fulfilled by Merchant to choose the best fulfillment strategy.
- **Forecast seasonal storage expenses**: Plan inventory for Q4 and other peak seasons by estimating increased storage fees ahead of time.

## Result preview

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

![This is a showcase report generated by the amazon-fba-calculator skill, visualizing a 6-page FBA profitability analysis for "Sensitive Wipes" with key metrics including a 30.9% margin and 108% ROI.](https://file.nanoskill.ai/amazon-fba-outcome1-1.png)

![This is a screenshot of the second page from the \`amazon-fba-calculator\` skill's 6-page FBA profitability report, detailing chargeable weight, size-tier qualification, and packaging sensitivity for the "Sensitive Wipes" product.](https://file.nanoskill.ai/amazon-fba-outcome2-1.png)

![This is page 3 of the amazon-fba-calculator skill’s 6-page FBA profitability report, illustrating how fulfillment and referral fees consume 40% of the selling price, with a detailed per-unit cost breakdown and cost share visualization for “Sensitive Wipes.”](https://file.nanoskill.ai/amazon-fba-outcome3-1.png)

![This is page 5 of the \`amazon-fba-calculator\` skill’s 6-page FBA profitability report, outlining a 30/60/90-day action plan and calculation critique for “Sensitive Wipes.”](https://file.nanoskill.ai/amazon-fba-outcome4-1.png)

## Result walkthrough

### Install

Add the Amazon FBA Calculator Skill to your AI agent.

![The screenshot shows an AI assistant successfully installing the amazon-fba-calculator skill from a GitHub repository.](https://file.nanoskill.ai/amazon-fba-install-1.png)

### Calculate Profitability

Enter your product dimensions, selling price, shipping cost, marketplace, and storage period to generate a complete FBA fee analysis.

![AI assistant loads FBA calculator to generate a 6-page Amazon profitability report, starting with baseline calculations using a representative product.](https://file.nanoskill.ai/amazon-fba-task-1.png)

### Optimize Margins

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

![This is a showcase report generated using the amazon-fba-calculator skill.](https://file.nanoskill.ai/amazon-fba-outcome-1.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 an Amazon FBA calculator and how does it work?

It's a tool that estimates all Amazon FBA fees—fulfillment, storage, referral—based on your product's dimensions, weight, selling price, and category. Input your product details, and it instantly outputs a full fee breakdown and profit analysis.

### Which fees does the Amazon FBA calculator include?

It covers FBA fulfillment fees (using 2024 rates), monthly storage fees (standard and peak season), long-term storage fees (for inventory aged 271+ days), and referral fees by category.

### Is this Amazon FBA calculator accurate for 2024 rates?

Yes, it uses the official 2024 Amazon FBA rate cards for size tiers, fulfillment, storage, and referral fees to give you the most up-to-date estimates.

### How do I use the Amazon FBA calculator for my products?

Simply provide your product's length, width, height, weight, selling price, product cost, inbound shipping cost, and category. The script runs and returns a fee breakdown, profit metrics, and optimization tips.

### Is the Amazon FBA calculator free?

Yes, the Lite version is open-source and free to use under the MIT license. You can run it locally with Python to get instant fee estimates.

### Can I calculate storage fees for inventory over 271 days?

Yes, the calculator includes long-term storage fees for items that have been in Amazon's fulfillment center for 271 days or longer, helping you avoid surprise charges.