UTM Marketing Attribution Reports with Google Sheets, GPT-4o & Gmail

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Built by Rahul Joshi Rahul Joshi
Created on June 05, 2026

Description

Description
Turn raw marketing data into actionable insights with this n8n Source/UTM Attribution and Reporting workflow! It automatically aggregates lead submissions, calculates Cost Per Lead (CPL) per channel, and generates AI-powered weekly attribution reports—delivered straight to your inbox in a professional HTML format.

What This Template Does

📅 Runs hourly to process new lead submissions
📊 Aggregates leads by source (Instagram, LinkedIn, Google Ads, etc.)
💰 Calculates key metrics like Cost Per Lead (CPL)
🧠 Uses AI to generate executive-ready HTML reports
📈 Highlights top-performing sources and growth opportunities
📧 Sends polished reports via Gmail automatically

Prerequisites
Google Sheets with lead submission data
Google Forms (or similar) as the data input source
n8n instance (self-hosted or cloud)
Azure OpenAI (GPT-4o-mini) API key for AI-powered reporting
Gmail API credentials for automated report delivery

Step-by-Step Setup
Trigger workflow hourly with n8n Scheduler.
Fetch new lead submissions from Google Sheets.
Aggregate and group data by Source/UTM parameters.
Calculate CPL using spend + lead count per channel.
Standardize column names for consistent reporting.
Send raw + aggregated data to Azure OpenAI for report generation.
Format into a professional HTML report (with insights & recommendations).
Send report via Gmail node to stakeholders.

Customization Ideas
Replace Gmail with Slack/Teams notifications for real-time sharing.
Add visual charts (Google Data Studio / Looker) for more analytics.
Use additional UTM fields (campaign, adgroup, creative) for deeper granularity.
Extend reporting to include ROI and ROAS calculations.

Key Benefits

✅ Hands-free attribution tracking and analysis
✅ Accurate CPL metrics per channel
✅ AI-generated reports with actionable insights
✅ Saves time vs. manual data crunching
✅ Weekly reports ensure marketing strategy stays optimized

Perfect For

Marketing teams managing multi-channel campaigns
Agencies providing client attribution reports
Business owners optimizing ad spend efficiency
Growth teams tracking lead quality by source

Nodes Used (5)

Azure OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatAzureOpenAi
Basic LLM Chain
@n8n/n8n-nodes-langchain.chainLlm
Code
n8n-nodes-base.code
Gmail
n8n-nodes-base.gmail
Google Sheets
n8n-nodes-base.googleSheets