Forecast inventory and auto-generate reorders with Google Sheets, GPT-4o mini and Slack

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1. Workflow Overview

How it works Fetches sales history and current inventory from Google Sheets in parallel, then calculates days of stock remaining, average daily sales velocity, and projected stockout dates for ever...

Best for

CRM automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.manualtrigger, n8n-nodes-base.code, n8n-nodes-base.set, n8n-nodes-base.googlesheets, n8n-nodes-base.merge, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.if

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Redowan Ahmed Farhan.

Original n8n.io source

1.1 Workflow description

Title: Forecast inventory and auto-generate reorders with Google Sheets, GPT-4o mini and Slack
Workflow name: Forecast inventory and auto-generate reorders with Google Sheets, GPT-4o mini and Slack

How it works

Fetches sales history and current inventory from Google Sheets in parallel, then calculates days of stock remaining, average daily sales velocity, and projected stockout dates for every product An AI agent (GPT-4o mini) analyzes the snapshot and generates a structured forecast report covering critical alerts, reorder priorities, demand trends, and supply chain risk flags Routes critical stock alerts to Slack instantly, generates purchase orders for all flagged items, and logs the full forecast summary back to Google Sheets

Set up steps

Connect Google Sheets OAuth2, add your spreadsheet ID in Set Forecast Configuration, and ensure your sheet has Sales_History, Current_Inventory, and Forcast_Analysis tabs (5 min) Add your OpenAI API key and connect your Slack workspace, then point the alert node to your preferred channel (5 min)

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - When clicking 'Execute workflow'

Type / Role: n8n-nodes-base.manualTrigger - manualTrigger
Config choices: Version 1

Block 2 - Combine Forecast and AI Output

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 3 - Set Forecast Configuration

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 4 - Fetch Sales History

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.5

Block 5 - Fetch Current Inventory

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.5

Block 6 - Merge

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 7 - Build Forecast Dataset

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 8 - Demand Forecast Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 9 - OpenAI Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.3

Block 10 - Critical Stock Exists?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 11 - Send a message

Type / Role: n8n-nodes-base.slack - slack
Config choices: Version 2.4

Block 12 - Write Forecast to Sheet

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.5

Block 13 - Generate Purchase Orders

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 14 - Log Forecast Completion

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 15 - Main Overview

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Section 1: Trigger & Data Intake

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Section 2: AI Forecasting

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Section 3: Alerts & Purchase Orders

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Section 4: Output & Logging

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Forecast inventory and auto-generate reorders with Google Sheets, GPT-4o mini and Slack
Complexity	advanced
Nodes	19
Categories	CRM, AI Summarization
Author	Redowan Ahmed Farhan
Published	14 May 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15706/15706.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source CRM workflows AI Summarization workflows

Frequently asked questions

What does Forecast inventory and auto-generate reorders with Google Sheets, GPT-4o mini and Slack do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your CRM, AI Summarization use case.

Redowan Ahmed Farhan

14 workflows

Nodes

n8n-nodes-base.manualtrigger n8n-nodes-base.code n8n-nodes-base.set n8n-nodes-base.googlesheets n8n-nodes-base.merge @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.if

Complexity

advanced

Published 14 May 2026

Likes 0

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Install path: /data/workflows/15706/15706.json

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Forecast inventory and auto-generate reorders with Google Sheets, GPT-4o mini and Slack

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - When clicking 'Execute workflow'

Block 2 - Combine Forecast and AI Output

Block 3 - Set Forecast Configuration

Block 4 - Fetch Sales History

Block 5 - Fetch Current Inventory

Block 6 - Merge

Block 7 - Build Forecast Dataset

Block 8 - Demand Forecast Agent

Block 9 - OpenAI Chat Model

Block 10 - Critical Stock Exists?

Block 11 - Send a message

Block 12 - Write Forecast to Sheet

Block 13 - Generate Purchase Orders

Block 14 - Log Forecast Completion

Block 15 - Main Overview

Block 16 - Section 1: Trigger & Data Intake

Block 17 - Section 2: AI Forecasting

Block 18 - Section 3: Alerts & Purchase Orders

Block 19 - Section 4: Output & Logging

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions