Health Score

Health Score is a single figure for a website's technical condition, familiar from tools such as Ahrefs Site Audit. The score runs from 0 to 100 and expresses the share of crawled internal URLs without technical errors, so one number tracks whether a technical SEO foundation is getting stronger or weaker.

What pulls the score down

The tool's crawler works through the site as a search engine would and logs the faults it meets: dead links and 404 pages, redirect chains, missing titles and meta descriptions, slow pages, and pages accidentally closed to indexing. Error types carry different weights, so a serious fault on an important page costs more than a cosmetic one on the periphery.

What the number can and cannot say

Google never sees the score itself. It is the tool's own calculation, though the faults behind it are real enough: broken links waste crawl budget, redirect chains dilute authority, and pages outside the index can neither rank nor be cited in AI answers. The figure works as a monitoring number, showing the direction of travel and exposing sudden losses after a release or migration.

A score of 100 is not the same as a healthy site, since the crawler only measures what it can see, and a site with a middling score can rank fine when the faults sit on peripheral pages. The faults behind the number, and the order they are worth clearing in, belong to the guide on site health and redirects.