BigQuery Cost Estimator

📊 Automatically replaces BigQuery’s query size estimate (GB) with the estimated cost in USD.

🚀 Overview

Google BigQuery displays a message like:

"This query will process 11.37 GB when run."

This script dynamically replaces that text with the estimated cost based on Google’s on-demand pricing. 💰 Cost Calculation: $6.25 per TB processed

---

✨ Features

• ✔ Real-time cost calculation as you type queries
• ✔ MutationObserver support for dynamic updates
• ✔ Lightweight & fast, no external dependencies
• ✔ Works in Chrome, Firefox, Edge, Brave, & Safari

---

🛠 Installation

1️⃣ Install a Userscript Manager

This script works with:

• ViolentMonkey (Recommended)
• TamperMonkey

2️⃣ Install the Script

🔹 From GreasyFork: BigQuery Cost Estimator

🔹 From GitHub: Click Here to install manually.

3️⃣ Open BigQuery & Run a Query

• The GB estimate will be replaced with the cost estimate automatically.

---

🏗 How It Works

1. Finds the GB estimate in BigQuery’s UI.
2. Extracts the numeric value from the message.
3. Calculates the cost using $6.25 per TB.
4. Replaces the text dynamically.

📌 Example Calculation:

Query processes: 11.37 GB
Cost = (11.37 GB ÷ 1024) × 6.25
Cost = $0.07

BigQuery now displays:

"Estimated cost: $0.07"

---

⚡ Technical Details

• Uses MutationObserver to detect changes in BigQuery’s UI.
• Targets the element: div.cfc-truncated-text.ng-star-inserted.
• Does not interfere with BigQuery’s functionality.

---

🚀 Contributing

Want to improve this script? PRs are welcome!

To Contribute:

1. Fork this repo
2. Clone your fork

   git clone https://github.com/dannberg/bigquery-cost-estimator.git

3. Make changes & push

git commit -m "Improved cost calculation"
git push origin main

4. Submit a Pull Request (PR)

---

📝 License

This project is licensed under the MIT License – you’re free to use, modify, and distribute it!

---

🔗 Links & Resources

• 📜 GreasyFork Script: BigQuery Cost Estimator
• 🏗 GitHub Repository: GitHub
• 🌎 Google BigQuery Pricing: BigQuery Pricing Docs