Overview
ObservePoint's Accessibility Scoring system provides a quantitative measure of your website's accessibility health. The Accessibility Score is calculated as a percentage from 0 to 100, reflecting the proportion of potential accessibility issues actually found on your pages. This metric helps you understand at a glance how well your site meets Web Content Accessibility Guidelines (WCAG) standards.
The score uses a weighted formula that accounts for both the severity and frequency of rule violations, giving you meaningful insights into where to prioritize remediation efforts.
The Scoring Formula
The Accessibility Score is calculated using the following formula:
Accessibility Score = 100 × (1 - actual penalties / maximum possible penalties)
This approach ensures that the score reflects:
Severity of issues - Critical issues have greater impact than minor ones
Frequency of issues - Issues that appear on multiple elements are weighted more heavily
Scope of testing - The score is normalized by the total number of elements checked
A higher score indicates fewer or less severe accessibility issues were found relative to what was tested.
Severity Levels and Penalty Weighting
Each rule violation contributes a penalty based on its severity level. ObservePoint uses a weighted penalty system to reflect the impact on users:
Severity Level | Penalty Weight | Definition |
Minor | 1 | Small impact on usability; minor inconveniences or deviations from best practices without significantly hindering access. |
Moderate | 3 | Noticeable challenges that can be overcome with some effort; impacts usability but doesn't completely block access. |
Serious | 5 | Significantly impacts usability, causing considerable inconvenience or difficulty without completely blocking access. |
Critical | 8 | Significantly hinders or completely blocks the ability of people with disabilities to access and use web content. |
How Penalties Are Calculated:
For each rule violation:
Identify the severity of the rule (1, 3, 5, or 8)
Count the frequency of failures across all elements checked
Calculate the penalty = severity weight × frequency
Sum all penalties to get the total actual penalties
Compare to maximum possible penalties if all checks had failed
Example: If a page checks 100 form fields and 20 are missing labels (critical issue, weight = 8):
Actual penalty = 8 × 20 = 160
Maximum possible penalty = 8 × 100 = 800
Score contribution = 160 / 800 = 20% penalty
Accessibility Score = 100 × (1 - 0.20) = 80
WCAG Versions and Conformance Levels
ObservePoint provides pre-calculated scores for multiple WCAG standards, allowing you to assess your accessibility across different regulatory and organizational requirements.
Supported WCAG Standards
ObservePoint supports all levels of conformance with the following WCAG versions:
WCAG 2.0 (Level A, AA, AAA)
WCAG 2.1 (Level A, AA, AAA)
WCAG 2.2 (Level A, AA, AAA)
Conformance Levels Explained
Level A — Basic accessibility support; foundational requirements
Level AA — Enhanced accessibility; the standard most organizations adopt for legal compliance
Level AAA — Advanced accessibility; the highest level of accessibility support
Note: Conformance at higher levels indicates conformance at lower levels. For example, a page that conforms to WCAG 2.1 AA meets both the A and AA requirements.
Interpreting Your Score
Your Accessibility Score serves as a high-level indicator of accessibility health, but interpretation should be context-dependent:
Score Range | Assessment | Recommendation |
90–100 | Excellent | Few or minor accessibility issues; maintain current practices. |
75–89 | Good | Some issues exist; prioritize critical and serious items. |
50–74 | Fair | Significant work needed; create a remediation roadmap. |
Below 50 | Poor | Urgent attention required; address critical issues first. |
Using Scores in Account-Wide Reports
ObservePoint pre-calculates Accessibility Scores for your entire account across all supported WCAG versions and conformance levels. This allows you to:
Choose your standard — Select the WCAG version (2.0, 2.1, or 2.2) that aligns with your legal or organizational requirements
Choose your conformance level — Opt for Level A, AA, or AAA based on your accessibility goals
View multiple perspectives — Compare your site's performance under different standards to understand where additional work is needed
Customize your focus — Create filtered reports showing scores by domain, page type, or location
For example, your site might score 85 for WCAG 2.1 AA but 65 for WCAG 2.1 AAA. This tells you that you've addressed most AA-level requirements but would need additional remediation for advanced AAA standards.
The results can be found in the Page Details Report, in the Accessibility Tab. Also, in the Reports Gallery, there are several templates dedicated to Accessibility Issues; use the templates on your Audits to validate and understand results.
Key Takeways
Accessibility Score combines severity and frequency of issues into a single percentage (0–100)
Severity weighting ensures critical issues have proportionally greater impact
Scores are pre-calculated across multiple WCAG versions and conformance levels
Use your score to track progress over time and prioritize remediation efforts
Higher scores reflect fewer or less severe accessibility barriers for users with disabilities
Conclusion
ObservePoint's Accessibility Score distills complex compliance data into a clear metric for tracking progress and prioritizing fixes. By weighting violations by severity and frequency, the score helps you focus remediation efforts where they matter most, which is on issues that genuinely impact users with disabilities.
Use your score as a baseline, monitor it over time, and complement automated testing with manual and usability testing to build a truly accessible experience.