Domain Authority (DA) and Page Authority (PA) are SEO metrics used to estimate how strongly a website or webpage may rank in search engines like Google. These metrics help SEO professionals compare websites, evaluate backlink strength, and measure ranking potential — especially in competitive markets like the United States.

Although Google does not officially use “Domain Authority” or “Page Authority” as direct ranking factors, these scores are widely used in the SEO industry to predict SEO strength.

The concepts became popular through Moz, which created both metrics.

What Is Domain Authority (DA)?

Domain Authority is a score that predicts the overall ranking strength of an entire domain or website.

The score ranges from:

• 1 to 100

Higher scores generally indicate stronger ranking potential.

For example:

• A new website may have DA 1–10
• A growing business site may have DA 20–40
• Large authority brands may have DA 70–90+

Examples of high-authority websites:

• Wikipedia
• Forbes
• The New York Times

These sites have massive backlink profiles and strong trust signals.

How Domain Authority Is Calculated

DA is calculated using multiple SEO factors, including:

• Number of backlinks
• Quality of backlinks
• Linking root domains
• Website trustworthiness
• Relevance
• Overall link profile strength

The algorithm is logarithmic, meaning:

• Increasing DA from 10 to 20 is easier
• Increasing DA from 70 to 80 is extremely difficult

What Is Page Authority (PA)?

Page Authority measures the ranking strength of an individual webpage rather than the entire website.

Like DA:

• PA ranges from 1–100

For example:

• Your homepage may have PA 50
• A blog post may have PA 20
• A viral guide may have PA 65

A website can have:

• High DA but low PA pages
• Low DA but one very strong PA page

Difference Between Domain Authority and Page Authority

Why DA and PA Matter in SEO

In the US SEO market, DA and PA help businesses:

• Analyze competitors
• Evaluate backlink opportunities
• Prioritize outreach
• Estimate ranking difficulty
• Measure SEO progress

For example:
If two websites compete for the keyword:
“Best SEO services USA”

The site with:

• Better backlinks
• Higher authority
• Stronger trust signals

often has an easier time ranking.

Are DA and PA Google Ranking Factors?

No.

Google does not officially use Moz Domain Authority or Page Authority scores.

However, Google does use concepts that are similar, including:

• Link authority
• Trust
• Relevance
• Page importance

DA and PA are third-party estimates designed to model ranking strength.

So while Google does not see “DA 50,” strong DA often correlates with better rankings because it reflects a strong backlink profile.

What Is Considered a Good Domain Authority?

DA scores are relative to competition.

General ranges:

In competitive US industries:

• Legal
• Finance
• SEO
• SaaS
• Healthcare

many top competitors have DA 50+.

How to Increase Domain Authority

1. Build High-Quality Backlinks

This is the biggest factor.

Focus on backlinks from:

• Trusted US websites
• Relevant industry blogs
• News publications
• Authority directories

Examples:

• HubSpot
• Search Engine Journal

2. Create High-Value Content

Content that attracts links naturally helps increase authority.

Good examples:

• Research studies
• Statistics pages
• Ultimate guides
• Original insights
• Case studies

3. Improve Internal Linking

Strong internal linking distributes authority across your website.

This helps:

• Search engine crawling
• Page authority flow
• User navigation

4. Remove Toxic Backlinks

Spammy backlinks can weaken trust.

Avoid:

• Link farms
• PBNs
• Automated spam links
• Irrelevant low-quality directories

5. Increase Brand Mentions

Brand recognition often leads to:

• More backlinks
• More citations
• More trust signals

Why Page Authority Is Important

Page Authority is especially useful for ranking individual pages.

For example:
A single well-optimized blog post with strong backlinks can outrank pages on larger websites.

High-PA pages usually have:

• Strong backlinks
• Great content
• Good user engagement
• Proper keyword targeting

DA vs DR vs Authority Score

Different SEO tools use different authority metrics.

Examples:

All attempt to estimate website strength using backlinks and trust signals.

Scores differ because each company uses different algorithms.

Limitations of DA and PA

These metrics are helpful but imperfect.

They should not be treated as absolute truth because:

• Google uses its own systems
• DA can be manipulated
• Some low-DA sites rank well
• Content quality still matters heavily

A website with lower DA can outrank a higher-DA competitor if:

• Content is better
• Search intent is stronger
• User experience is superior
• Topical relevance is higher

Topical Authority vs Domain Authority

In 2026 SEO, topical authority is becoming increasingly important.

Topical authority means:
Google sees your website as an expert in a specific niche.

For example:
A travel-focused website may rank well for tourism content even with lower DA than a general news site.

Modern SEO rewards:

• Expertise
• Relevance
• Depth
• Content quality
• E-E-A-T signals

not just raw authority metrics.

Best Tools to Check DA and PA

Popular SEO tools include:

• Moz
• Ahrefs
• Semrush
• Majestic

These tools help analyze:

• Backlinks
• Competitors
• Authority metrics
• Link opportunities

Final Thoughts

Domain Authority and Page Authority are useful SEO metrics that estimate how strong a website or webpage may perform in search results. In the competitive US market, they help businesses understand backlink strength, competitor difficulty, and overall SEO growth.

However, DA and PA should not be the only focus.

Real SEO success comes from:

• High-quality content
• Relevant backlinks
• Strong technical SEO
• Great user experience
• Topical authority
• Brand trust

In modern SEO, authority is no longer just about link quantity — it is about credibility, expertise, and value to users.