Many SEO tools assign websites a score that estimates their overall strength, often called domain authority, domain rating or authority score. These metrics are popular for comparing websites, evaluating link opportunities and tracking growth. However, they are third-party estimates, not metrics used by Google. Understanding what they represent helps you use them wisely.
What Authority Scores Measure
Most authority metrics estimate a site’s ranking potential based on the quantity and quality of its backlinks and referring domains. Each tool uses its own data and formula, so scores differ between tools.
| — | — |
|---|---|
| Scale | Usually 0–100, often logarithmic |
| Data source | Tool’s own web crawl and link index |
Logarithmic Scales
On many scales, moving from 20 to 30 is easier than moving from 70 to 80. High scores require exponentially stronger link profiles.
Useful Ways to Use Authority Scores
- Compare your site with direct competitors
- Track your own trend over time
- Prioritise outreach targets for guest posts and partnerships
- Estimate how competitive a search results page may be
- Spot sudden drops or gains that need investigation
Limitations
| — | — |
|---|---|
| Site-level only | Individual page quality matters for rankings |
| Ignores relevance | A high-scoring unrelated site may be less valuable than a relevant smaller one |
Better Ways to Evaluate a Website
| — | — |
|---|---|
| Audience engagement | Comments, shares and community |
Improving Your Site’s Authority Signals
- Create useful, linkable content
- Earn links from relevant, reputable sites
- Build relationships and digital PR
- Fix broken pages that have backlinks
- Strengthen internal linking
These actions improve real SEO strength, and third-party scores often follow.
Common Mistakes
- Buying links to raise authority scores
- Rejecting relevant link opportunities because of low scores
- Treating scores as Google rankings factors
- Comparing scores from different tools directly
Frequently Asked Questions
Does Google use domain authority?
No. Domain authority metrics are created by third-party tools.
What is a good authority score?
It is relative; compare with competitors in your niche.
Why did my score drop?
Tools update their indexes and formulas; competitor growth and lost links also affect scores.
Can I check authority for free?
Many tools offer limited free checks.
Conclusion
Domain authority checkers provide useful estimates for comparing websites and tracking link growth, but they are not Google metrics. Use them alongside relevance, traffic and quality, and focus on earning genuine links and creating valuable content.
