amazon-fba-calculator — Claude Code skill: install and overview
Identifies Amazon size tiers and calculates FBA fees using 2024 rate tables. Useful for checking unit margins and ROI before shipping inventory to fulfillment centers.
npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a claude-codeWhat amazon-fba-calculator does
The skill automates FBA fee calculations based on product packaging dimensions and weight. It classifies items into tiers from Small Standard to Special Oversize, then computes fulfillment costs, monthly storage fees for standard or peak periods, and long-term storage fees for inventory past 271 days.
Execution relies on the Python script scripts/calculator.py. It takes a JSON payload with package dimensions, weight, selling price, product cost, inbound shipping, and category. The output returns a structured fee breakdown table, net and gross margins, ROI metrics, and packaging optimization tips.
Running this requires Python 3 installed locally. Because fee logic follows 2024 rate cards, you will need to check the numbers if Amazon updates its pricing tiers.
What it helps with
- determine product size tier from package dimensions and weight
- calculate FBA fulfillment and monthly storage fees using 2024 tables
- analyze net margin, gross margin, and unit ROI
- estimate long-term storage fees for stock held beyond 271 days
Example prompts for the agent
- Calculate FBA fees for a 10x6x3 inch item weighing 1.2 lbs priced at 29.99 in the kitchen category
- Run python3 scripts/calculator.py with unit cost 8.00 and inbound shipping 1.50 to check margins
How to install amazon-fba-calculator
1Skills CLI (Vercel)
npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a claude-code2Manually: put the files in place
~/.claude/skills/amazon-fba-calculator/SKILL.mdCopy the whole skill folder; for one project use .claude/skills/amazon-fba-calculator/
1Skills CLI (Vercel)
npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a codex2Manually: put the files in place
.agents/skills/amazon-fba-calculator/SKILL.mdFor all projects use ~/.agents/skills/
1Skills CLI (Vercel)
npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a cursor2Manually: put the files in place
.cursor/skills/amazon-fba-calculator/SKILL.mdCursor also reads .agents/skills/ and .claude/skills/
1GitHub CLI
gh skill install nexscope-ai/Amazon-Skills amazon-fba-calculator2Manually: put the files in place
.github/skills/amazon-fba-calculator/SKILL.md1Skills CLI (Vercel)
npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a gemini-cli2Platform CLI
gemini skills install https://github.com/nexscope-ai/Amazon-Skills --path amazon-fba-calculatorManually: put the files in place
.devin/skills/amazon-fba-calculator/SKILL.mdThe legacy .windsurf/skills/ path still works
Skills CLI (Vercel)
npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a opencodeClaude.ai
Zip the folder and upload it in Settings → Capabilities → Skills
Step by step, with commands for each platform: How to install skills in Claude Code: five ways
Questions about amazon-fba-calculator
How to install amazon-fba-calculator in Claude Code?
Run npx skills add nexscope-ai/Amazon-Skills --skill amazon-fba-calculator -a claude-code in your terminal. The command downloads and registers the skill files for Claude Code.
What fees does amazon-fba-calculator evaluate?
It computes FBA fulfillment fees, standard and peak monthly storage fees, category referral rates, and long-term storage fees for products aged over 271 days.
What inputs are required to calculate profit metrics?
You need to provide length, width, height, weight, selling price, product unit cost, inbound shipping cost, and the product category.
Source text
SKILL.md · MIT
---
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.**
© nexscope-ai · MIT · nexscope-ai/Amazon-Skills
