Scores are numeric ratings ranging from 0 to 100, and appear for most tests. They aim to summarize how good or bad the website is doing for test as briefly as possible, providing a quick comparison between websites.
This is an example score of 80 for the Grammar test:
How scores are calculated
The score for each test is calculated from a weighted average of whatever the score covers. For example, some percentage of the Content score is awarded for having no spelling errors, and a smaller portion is awarded for having no grammar errors.
You can see a breakdown of what goes into your overall scores by clicking the “View score breakdown” link that appears on summary pages, including the first page of your report:
This will open a breakdown of the checks which go into the score, like so:
Items in red are not currently scoring perfectly, and can be improved.
For each item you will see the points gained and the points available. The number of points available indicates how much that check is worth (e.g. in the above screenshot, “Fix misspellings” is worth 1.01 points). The gained points shows how much of that available score has been achieved. If the check is 100% complete, the gained will be the same as the available.
The precise weightings for each test vary slightly over time, as we are continually refining them based on the changing nature of the web. Generally higher priority, more severe issues have a greater impact on overall score.