How do Google Ads calculate ad rank?

Ad Rank is calculated using your bid amount, your auction-time ad quality (including expected clickthrough rate, ad relevance, and landing page experience), the Ad Rank thresholds, the context of the person’s search (for example, the person’s location, device, time of search, the nature of the search terms, the other ads and search results that show on the page, and other user signals and attributes), and the expected impact of extensions and other ad formats.
For More Information Please Refer:
https://support.google.com/google-ads/answer/1752122?hl=en
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