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The A1 Score™

The definitive measure of your website’s health

One number. Four pillars. A clear, honest grade that tells you exactly where your site stands — and what it’s costing you to stay there.

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How it’s calculated

Four pillars, equally weighted

Every A1 Score™ is built from four categories, each powered by Google’s Lighthouse engine and contributing 25% to your overall grade.

25% of your score
⚡

Speed & Performance

The foundation of everything. A fast site ranks better, converts better and keeps visitors engaged. Every second of delay costs you.

First Contentful Paint (FCP)
Largest Contentful Paint (LCP)
Total Blocking Time (TBT)
Cumulative Layout Shift (CLS)
Render-blocking resources
25% of your score
🔍

SEO

The signals that determine whether Google can find you, understand you, and rank you above competitors.

Meta descriptions & page titles
Crawlability & robots.txt
Link text quality
Mobile font sizing
Structured data signals
25% of your score
♿

Accessibility

Over 1 billion people live with a disability. An inaccessible site shuts them out — and Google notices.

Colour contrast ratios
Image alt text
Form label clarity
Keyboard navigability
ARIA attributes
25% of your score
🛡️

Best Practices

The technical hygiene that makes your site trustworthy, secure and future-proof for users and search engines alike.

HTTPS & secure connections
No vulnerable JS libraries
Console error-free
Correct image aspect ratios
Content Security Policy
The grading system

What each grade means

A1
90–100
Exceptional — The Gold Standard
An A1 is the highest grade we give, and very few sites earn it. Your site is fast, discoverable, accessible and technically sound. You’re ahead of the vast majority of websites online. Keep it here.
Top tierExceptional performance
A
80–89
Excellent — Nearly There
Your site is performing well above average. A handful of specific improvements stand between you and an A1 rating. These are refinements, not overhauls.
Strong performanceMinor improvements available
B
65–79
Good — Room to Improve
Above average but with meaningful gaps. Your site works, but issues are slowing you down in search rankings and user experience. Targeted fixes could unlock significant improvements.
Above averageImprovement worthwhile
C
50–64
Needs Attention — Losing Ground
A C grade is a warning. Your site has meaningful issues actively affecting your search rankings and user experience. Visitors are likely bouncing before your content loads. This is the grade where action matters most.
Below averageRankings at risk
D
35–49
Poor — Significant Problems
Your site has serious technical problems costing you visitors and revenue every day. Slow load times, broken SEO signals and accessibility failures compound each other. Urgent fixes are needed.
Significant traffic lossUser experience failing
F
0–34
Critical — Immediate Action Required
An F means critical failures across multiple areas. You are almost certainly invisible to Google for many searches, your load time is driving visitors away within seconds, and your site may have security vulnerabilities. Every day without action is a day your competitors pull further ahead.
Critical failuresImmediate action needed
The real cost

What a bad score is costing you

These are not hypothetical numbers. They are the measurable, documented impact of poor website performance.

53%
of mobile visitors leave
if your page takes longer than 3 seconds to load. Google’s own research. Half your traffic — gone before they read a word.
7%
conversion drop per second
Every additional second of load time reduces conversions by an average of 7%. A 5-second site converts at half the rate of a 1-second site.
Top 3
results get 75% of clicks
If your score is holding your ranking back, the traffic going to positions 1, 2 and 3 is traffic that should be going to you.
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What grade is
your site sitting on?

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