What Is a Good SEO Score?

PageSpeed Insights gives every website four scores: Performance, Accessibility, Best Practices, and SEO. The SEO score is the easiest to ace — most well-built sites hit 95+ effortlessly. Here's what it measures and what a good score actually means.

The score ranges

For SEO specifically, 95 and above is the realistic target. Unlike performance, where mobile drags the score down, the SEO audit is binary — most checks either pass or fail.

If your SEO score is under 90, something basic is broken. Under 80 and your site might not even be crawlable.

What Lighthouse actually checks

The Lighthouse SEO category audits technical SEO — the foundation that makes your site eligible to rank, not what makes it rank well.

Specifically:

1. Crawlability and indexability

• Page has a valid robots.txt
• Page isn't blocked from indexing (no noindex meta tag if you want it to rank)
• Page returns a 200 status code
• Links are crawlable (use <a href>, not JavaScript-only navigation)

2. Mobile-friendliness

• Viewport meta tag present
• Tap targets sized appropriately (at least 48×48 px)
• Text legible at default zoom

3. Content basics

• <title> tag present and reasonable length
• Meta description present
• Document has a valid language declaration (lang attribute)
• Headings used in a logical order (H1 → H2 → H3)

4. Structured data validity

• Any application/ld+json blocks are valid JSON-LD
• Schema.org types are recognized

5. Image accessibility (overlap with A11y)

• Images have alt attributes

What Lighthouse SEO does NOT check

This is where most people get the wrong idea. Lighthouse SEO is a technical floor, not a ceiling. It does not measure:

• Content quality or relevance
• Keyword targeting
• Backlinks or domain authority
• Internal link structure beyond crawlability
• Topical authority
• E-E-A-T signals (experience, expertise, authority, trust)
• Sitemap quality
• Canonical tag correctness (it checks for presence, not correctness)
• Duplicate content issues
• Page speed's impact on ranking (that's the Performance score)

A site can score 100/100 SEO in Lighthouse and rank for nothing.

How to get to 100

If you're under 95, the report tells you exactly what's wrong. Common issues:

"Document doesn't have a valid <title>"

Add a unique, descriptive <title> under 60 characters. Example:

<title>What Is a Good SEO Score? | RateMySite</title>

"Document doesn't have a meta description"

Add one under 160 characters that summarizes the page:

<meta name="description" content="..." />

"Page is blocked from indexing"

You have <meta name="robots" content="noindex"> or X-Robots-Tag: noindex in your headers. Remove these from pages you want indexed.

"robots.txt is not valid"

Your robots.txt has syntax errors. Test it in Google Search Console's robots.txt tester.

"Tap targets are not sized appropriately"

Buttons and links are too close together or too small for fingers. Use a minimum 48×48px tap area.

"Image elements do not have [alt] attributes"

Add descriptive alt text to images for both accessibility and SEO.

How to actually rank

A 100 Lighthouse SEO score is necessary but not sufficient. To actually rank you need:

1. Useful content that answers real searcher intent
2. A site structure that signals topical authority (clusters of related pages linking to each other)
3. Backlinks from relevant, authoritative sites
4. Passing Core Web Vitals for the SEO ranking boost
5. A reliable hosting and crawl experience so Google can index everything reliably

The Lighthouse audit gives you the floor. The other 95% of SEO work happens off-Lighthouse.

How to improve

If you want a quick action plan for the Lighthouse SEO score specifically:

1. Run a free audit and fix every red and amber issue in the SEO category.
2. Add unique meta titles and descriptions to every page.
3. Ensure all images have alt text.
4. Make sure your robots.txt and sitemap.xml are valid and accessible.
5. Add JSON-LD structured data for your content type (Article, Product, FAQ, etc.).

For the broader topic, see how to improve your website SEO score.

The bottom line

A good Lighthouse SEO score is 95+, and it should be easy to get there. But Lighthouse SEO is just the technical floor — actual ranking depends on content, links, and topical authority that Lighthouse doesn't measure.

Fix the basics, then go do the real SEO work.