Accessibility Web Score

The Accessibility Score is a unified metric that represents the accessibility health of your website or application workflow. Gone are the days of sifting through lengthy accessibility reports trying to figure out what matters most. The Accessibility Score gives you a clear, actionable number that tells you exactly where your product stands on accessibility compliance. Use this score to track your progress over time, compare releases, and demonstrate tangible improvements to stakeholders.

Who needs this?

The Accessibility Score helps:

• Product Managers who need to quantify accessibility health and present progress to leadership
• QA Engineers tracking accessibility improvements across sprints
• Accessibility Teams monitoring compliance and identifying problem areas
• Developers who want quick feedback on whether their changes improve or hurt accessibility

If you're building digital products that real people use, this score matters.

Where to find it

Navigate to any completed accessibility test in your LambdaTest dashboard. The Accessibility Score appears prominently in the test report, giving you an instant read on how that specific scan performed.

---

How the score is calculated

The Accessibility Score reflects both how many accessibility issues exist and how severe those issues are. A site with 100 minor issues scores differently than one with 10 critical blockers, and our formula accounts for that reality.

Step 1: Weight issues by severity

Not all accessibility violations carry equal impact. A missing form label (critical) prevents screen reader users from completing tasks, while a small color contrast issue (minor) might only affect readability slightly.

We assign each severity level a multiplier:

Severity	Weight	Why this matters
Critical	1.0	Complete blockers that prevent access
Serious	0.75	Major barriers that significantly impair experience
Moderate	0.50	Notable issues affecting usability
Minor	0.25	Small problems with limited impact

Calculate the weighted severity (z):

z = (% critical × 1.0) + (% serious × 0.75) + (% moderate × 0.50) + (% minor × 0.25)

This gives us a single number representing the severity distribution across all issues found.

Step 2: Measure issue density

Raw issue counts don't tell the whole story. Finding 50 issues on a page with 1,000 elements is different from finding 50 issues on a page with 100 elements.

Calculate the density (y):

y = Total issues / Total elements

This ratio shows how widespread accessibility problems are across your page structure.

Step 3: Calculate the final score

We combine severity weighting and issue density to determine how much they should reduce your score from a perfect 100:

Accessibility Score = 100 - (y × 100 × z)

The score scales from 0 to 100, where:

• 90-100: Excellent accessibility with minimal issues
• 70-89: Good, but room for improvement
• 50-69: Moderate issues requiring attention
• Below 50: Significant accessibility barriers present

Note: The Accessibility Score is a proprietary metric developed by LambdaTest. This scoring methodology is unique to our platform and provides a tailored approach to measuring accessibility health.

---

Calculating scores across pages and tests

The same formula applies whether you're looking at a single page or an entire test with multiple pages. This approach ensures that particularly problematic pages don't get hidden by well-performing ones, giving you an accurate view of your overall accessibility health.

---

What impacts your score

• Severity distribution: A page with mostly critical issues scores lower than one with mostly minor issues, even if the total count is the same.
• Issue density: More issues relative to page elements means a lower score. A complex page with many elements can absorb more issues before the score drops dramatically.
• Total element count: Pages with more elements have more opportunities for issues, but the density calculation accounts for this fairly.

---

Improving your score

Focus on high-impact changes:

1. Fix critical issues first - They carry the most weight and create real barriers for users
2. Reduce issue density - Systematic problems affecting many elements hurt your score more than isolated issues
3. Test iteratively - Run scans after each fix to track improvements in real-time

Remember

The goal isn't gaming the score, it's making your product genuinely accessible to everyone.