How Google calculates it
Google's Performance report help defines the chart value as "the average position of the topmost result from your site". Each time the site appears, only its highest link counts, and those positions are averaged across impressions. Positions are counted from top to bottom on the main column of the page, then the side column (Google help).
A short example: three impressions at #3, #5 and #10 average to 6.0, a position the site never actually held.
How it shows up in RankUpside
Average position sits on each client's key figures and next to every search. Sample data: Copperline Gutters, a fictional business on a reserved .example domain. Average position on buyer searches improved from 34.8 to 24.6 over four weeks.
Report totals are added up per page, so impressions run higher, and average position a little worse, than Search Console's property view. The tile says "added up per page".
The weekly live rank check adds today's rank for up to 50 of each client's searches, so the average and a real results page can be read side by side.
In our own calibration run on three sites we operate (13 weeks to Oct 11, 2026, measured Oct 20, 2026), searches where a site was listed in the map pack or cited in an AI Overview showed Search Console positions near the top of the page, close to that feature's slot. A high average doesn't always mean a top organic link.