Full Answer

BigQuery pricing works on two axes: storage and compute. The free tier gives you 10 GB of active storage and 1 TB of query processing every month — no credit card trial, no expiry date. For a WooCommerce store sending page views, add-to-cart events, and purchase confirmations through a server-side pipeline, the data footprint stays modest. A store with 50,000 monthly sessions and 1,000 orders typically accumulates around 500 MB per month of structured event data.

Once you cross the free threshold, storage costs roughly two cents per gigabyte per month, and queries cost five dollars per terabyte scanned. Partition your tables by date, and most daily queries scan only a few megabytes — meaning your monthly bill barely registers. High-traffic stores processing tens of thousands of orders may reach five to fifty dollars a month depending on query patterns and retention policy.

The real cost comparison matters more than the sticker price. GA4 360 starts at fifty thousand dollars a year. Third-party CDP tools charge per event or per profile, often reaching hundreds of dollars a month at scale. BigQuery gives you raw event-level access, unlimited retention, and native AI/ML functions — all on infrastructure you control. The free tier alone covers the majority of small WooCommerce stores for years before any billing kicks in.