GA4Conversion rate is orders divided by sessions. When it moves, four things may have changed: what gets counted, who arrives, where they land, or what they are offered. Check them in that order.
Check in this order
- First, the count. Do store orders and analytics orders match for the same days? A broken purchase event or a changed time zone looks like a drop in conversion.
- Second, the visitors. A new source, a new campaign or a broader audience with less buying intent lowers the rate, even if the site has not changed.
- Third, the path. Compare by device and by landing page. A fault on one device or one product page shows as a drop in one slice only.
- Fourth, the offer. Price, shipping cost, delivery time, stock and discounts all move the rate. Check the store's own change history.
Common traps
- Comparing a sale week with a normal week and calling the gap a result.
- Reading one day. Small days swing, so use at least a full week and the same days of the week.
Writing it up
- Name the slice that moved, the number before and after, and the check that found it.
Made-up scenario: conversion rate fell from 2.4 to 1.6 percent on a Thursday. Store orders fell too, so the drop was real and not a counting fault. On mobile, add-to-cart was steady but purchases fell sharply. A payment step had failed for that device only. The fault was on the site, and the ads were not the cause.
