What Is a Website Health Score?

Why one number beats five dashboards

Uptime monitoring, performance checks, error tracking, and stability checks each answer a narrow question on their own. Reviewing several separate views to answer "is the site healthy today" does not scale once you are watching more than a couple of pages.

Without a composite score, teams tend to notice degradation only after one specific check turns red — by which point response times may have already been drifting upward, or a journey may have already been failing intermittently for days.

How NorthDuty calculates the score

Every NorthDuty project has a single health score from 0 to 100. It recalculates automatically each time a health check completes, so it always reflects the most recent evidence rather than a stale snapshot.

The score is a weighted composite of four components: uptime (weight 30), performance (25), errors (15), and stability (10), each weighted by how directly it affects whether a visitor can use the page. Security, accessibility, and SEO are scored separately and do not move the headline number, and user journeys are reported on their own rather than folded into the score.

If a check has not measured one of the components — for example, no performance timing was captured — that component is left out and the score is normalized over whatever was measured. The score never penalizes you for data it does not have, but it also will not tell you the full story until every component has been measured.

Conclusion

A health score is only useful if it is built from real, continuously collected evidence rather than a single check run once a day.

NorthDuty recalculates its 0-100 score from uptime, performance, errors, and stability every time a health check completes, giving teams one trustworthy number to watch alongside journey results and the detailed checks behind it.