Authority Score

How it works

Authority Score is calculated from three main inputs. Link Power measures the quality and quantity of backlinks pointing to a domain or page. Organic Traffic estimates the average monthly traffic the site receives from search engines. Spam Factors detect manipulation or unnatural link profiles, such as no organic rankings, unusually high dofollow ratios, IP or network concentration, and identical backlink profiles.

Semrush updates the metric periodically, adjusting the weighting of these inputs. The current formula places more emphasis on organic traffic and spam signals than earlier versions did. The score ranges from 1 to 100, with higher values indicating stronger estimated authority.

The score appears in several Semrush tools, including Domain Overview, Backlinks Tool, Backlink Audit, and Website Authority Checker. Because it is proprietary, the calculation can change without notice, so treat it as a relative benchmark rather than a fixed value.

Where it changes your decision

• When evaluating link prospects: a high Authority Score suggests the linking domain has strong backlink and traffic signals, making it a more valuable target for outreach, but you still need to check topical relevance and link context.
• When benchmarking competitors: comparing Authority Scores across competing domains helps you identify which sites have stronger estimated authority and where you need to improve your own link profile and organic traffic.
• When monitoring growth over time: tracking Authority Score trends (not single-point changes) helps you assess whether your off-site SEO efforts are moving the needle, provided you also review the underlying backlink and traffic data.

What it is not

• It is not a Google ranking factor. Google does not use Authority Score or any similar third-party metric in its algorithm.
• It is not the same as domain authority or domain rating ahrefs. Each tool uses its own formula and data sources, so scores are not directly comparable across platforms.
• It is not a fixed benchmark. Scores can fluctuate when Semrush updates its formula, weighting, or spam detection rules, or when backlink data, traffic estimates, or index coverage changes.
• It is not a substitute for qualitative analysis. A high score does not guarantee that a link is relevant, natural, or topically aligned with your site.

Common mistakes

• Treating Authority Score as a Google metric or direct ranking factor: this leads to false confidence or unnecessary panic, because the score has no influence on search rankings.
• Comparing Semrush Authority Score directly with Ahrefs Domain Rating or Moz Domain Authority as if they were identical measures: each tool uses different inputs and scales, so the numbers are not interchangeable.
• Chasing a higher score without checking whether the backlink profile is relevant, natural, and topically aligned: this can result in acquiring low-quality links that harm your site's credibility.
• Using one score change as a short-term success signal instead of watching longer-term trends: single-point fluctuations are often noise caused by data updates, not genuine changes in site quality.