SKU.io Ops Calculators for Claude and ChatGPT
SKU.io Ops Calculators is a set of read-only calculators for people who run inventory and operations for an online or wholesale business. You use them from inside Claude or ChatGPT: paste rows from a spreadsheet, paste a report or EDI document, or answer a few questions, and the assistant runs the calculation and shows the result as a table you can sort and filter.
They do not need a sku.io account, and they do not connect to any store, marketplace or accounting system. What you share is processed in memory for that one request and is not stored. See the privacy policy for the details.
Add them to Claude
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In Claude, go to Customize → Connectors, click Add, and choose Add custom connector.
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Name it SKU.io Ops Calculators and paste this URL:
https://tools.sku.io/mcp/all -
Click Add. Claude detects that no sign-in is needed. Leave the authentication options as they are.
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In a chat, ask a question like the examples below. Claude asks before it uses a calculator for the first time.
Use them in ChatGPT
In ChatGPT, go to Plugins, click Add, and choose Add custom MCP server. Name it SKU.io Ops Calculators, paste the same URL as the Server URL, set Authentication to No authentication, and click Create as a plugin.
What each calculator does
| Calculator | What it answers | What to give it |
|---|---|---|
| Plan reorder points | When to reorder each SKU, how much, safety stock and reorder point | Sales by SKU and stock on hand; lead time |
| Plan FBA restock | How many units to send to Amazon FBA and what runs out first | FBA inventory and sales by SKU; transit days |
| Check inventory health | Dead stock, overstock, at-risk SKUs and cash tied up | Stock on hand with cost, and sales by SKU |
| Forecast demand | Expected units per SKU over the coming weeks | Sales history by SKU and date |
| ABC / XYZ inventory analysis | Which SKUs drive revenue and how steady their demand is | Sales by SKU, with prices |
| Calculate inventory KPIs | Turnover, days of inventory, sell-through and GMROI | Stock on hand with cost, and sales |
| Calculate landed cost | Landed cost per unit with freight, duty and fees allocated across a PO | PO lines (SKU, quantity, unit cost); freight, duty and fees |
| Calculate tariff impact | What a tariff change does to margin, and the price that keeps it | Products with cost and sell price; current and new rate |
| Build purchase orders | Draft POs per supplier, rounded to case packs and minimums | What to reorder, and a supplier catalog |
| Calculate BOM cost | What a finished product costs to make, and how many you can build | Bill of materials with component costs |
| Build a wholesale line sheet | Wholesale and suggested retail prices from your target margin | Products with cost |
| Generate SKUs | A consistent SKU for every product and variant | Product names and attributes |
| Calculate Shopify profit | Real profit per order and SKU after fees and costs | Shopify orders, and product costs |
| Explain Amazon settlement | Where an Amazon payout went: sales, fees, refunds and adjustments | The settlement report, pasted as text |
| Explain Amazon listing errors | What listing error codes mean and how to fix them | The error report, pasted as text |
| Translate EDI | What an X12 document (850, 856, 810 and others) says, and structural errors | The raw EDI text |
| Analyze retailer chargebacks | Deductions grouped by reason, and which to dispute | The deduction list |
| Check supplier invoice | Invoice lines that do not match the PO or what was received | Invoice, PO and receipt lines |
| Reconcile inventory to the GL | Why the inventory value does not match the ledger | Inventory valuation and GL balance |
| Compare 3PL quotes | What each fulfillment warehouse would cost per month and per order | Each quote’s fees and your order profile |
| Compare software costs | What each software option costs over several years | Each quote’s fees |
| Build system requirements | A requirements checklist for choosing inventory or ERP software | Your channels, order volume, SKUs and warehouses |
Example prompts
- “Plan reorders for these SKUs. Lead time is 21 days. Sales, last 30 days: TEE-BLK-M 240 units, TEE-WHT-M 90, CAP-NVY 15. On hand: TEE-BLK-M 120, TEE-WHT-M 300, CAP-NVY 40.”
- “What is my landed cost per unit on this PO? 500 mugs at $2.10, 300 tumblers at $4.80, 200 coasters at $0.60. Freight $1,150, duty 6.5%, brokerage $175. Allocate freight by value.”
- “Tariffs on my products go from 10% to 35%. Unit cost and sell price: lamp $18 / $59, shade $6 / $24, bulb pack $3 / $12. What happens to my margins and what prices keep them?”
- “Compare these 3PL quotes for 1,500 orders a month, 1.4 items per order: Warehouse A charges $3.25 per order and $0.55 per extra item, Warehouse B charges $2.90 per order and $0.75 per extra item.”
- “Help me write requirements for new inventory software. We sell on Shopify, Amazon and Walmart, about 4,000 orders a month, 350 SKUs, one warehouse plus a 3PL and FBA.”
Good to know
- Results are estimates to check, not accounting, tax or legal advice. Each result shows the inputs and the math it used.
- The calculators only read what you give them. They never change data anywhere.
- Questions or a calculation that looks wrong: email support@sku.io.
If you already use sku.io and want Claude or ChatGPT to look up your live stock and orders instead, see Connect an AI assistant.