Technical SEO Audit Score
Score your website's technical SEO health from 0 to 100 by analysing crawl errors, indexation completeness, XML sitemap presence, and SSL status. Use it to triage technical issues before an optimisation sprint.
About this calculator
The score is built from two additive parts. The primary component is: (85 − crawlErrors × 2) × (indexedPages / totalPages) × sitemapStatus × (1 if SSL, else 0.7). This rewards a clean crawl, a high ratio of indexed-to-total pages, a submitted XML sitemap, and a valid SSL certificate. If SSL is present, a flat 15-point bonus is added, bringing the maximum achievable score to 100. The full formula is: Score = clamp(0, 100, (85 − crawlErrors × 2) × (indexedPages / totalPages) × sitemapStatus × (sslStatus == 1 ? 1 : 0.7) + (sslStatus == 1 ? 15 : 0)). Missing SSL alone caps your maximum primary component at roughly 59.5 (= 85 × 0.7) and forfeits the 15-point bonus, illustrating just how heavily security is weighted. Every crawl error beyond 42 would push the bracketed term negative, so fixing errors is critical.
How to use
Assume 3 crawl errors, 90 indexed pages, 100 total pages, sitemap present (sitemapStatus = 1), and SSL active (sslStatus = 1). Step 1 — crawl base: 85 − (3 × 2) = 79. Step 2 — indexation ratio: 90 / 100 = 0.9. Step 3 — multiply by sitemap and SSL factors: 79 × 0.9 × 1 × 1 = 71.1. Step 4 — add SSL bonus: 71.1 + 15 = 86.1. Step 5 — clamp and round: 86. Your technical SEO audit score is 86 out of 100.
Frequently asked questions
What is a passing technical SEO audit score and how should I interpret the results?
Scores of 80 or above indicate a technically sound site where crawlers can efficiently discover, access, and index your content. Scores between 60 and 79 suggest moderate issues—often a combination of some crawl errors and an indexation ratio below 90%—that may be silently suppressing rankings. Scores below 60 signal serious structural problems such as widespread crawl errors, missing XML sitemaps, or no SSL, any of which can prevent Google from properly evaluating your content. Treat the individual input values as a diagnostic checklist: the component that reduces your score the most is your highest-priority fix.
How does an XML sitemap affect crawl efficiency and the audit score?
The sitemapStatus field acts as a direct multiplier in the formula, so without a sitemap (sitemapStatus = 0) the entire primary score component collapses to zero, leaving only the potential 15-point SSL bonus. A well-structured XML sitemap tells search engine crawlers exactly which URLs you want indexed, reducing wasted crawl budget on duplicate, thin, or non-canonical pages. For large sites with hundreds of pages, a missing or outdated sitemap can mean important new content takes weeks to be discovered. Submitting your sitemap via Google Search Console is a foundational step that costs nothing and has a measurable positive impact.
Why does missing an SSL certificate reduce my technical SEO score so significantly?
SSL (HTTPS) affects the audit score in two ways: it switches the primary multiplier from 1.0 to 0.7 and removes the 15-point flat bonus, together costing up to 40+ points depending on your other inputs. Google confirmed HTTPS as a ranking signal in 2014, and Chrome now displays 'Not Secure' warnings on HTTP pages, which increases bounce rates and erodes user trust. From a technical standpoint, HTTP pages cannot use HTTP/2 or many modern performance features that indirectly support SEO. Free SSL certificates via Let's Encrypt have made there essentially no cost barrier to securing your site.