Topical Authority vs. Domain Authority: What’s the Difference?

If you work on SEO long enough, you’ll eventually hear people talk about topical authority and Domain Authority.

They sound similar, but they’re not the same thing.

And there’s an important distinction business owners should understand:

Neither is an official Google ranking score.

Topical authority is an SEO concept used to describe how thoroughly and credibly a website covers a particular subject.

Domain Authority is a third-party metric used by SEO tools to estimate the relative strength of a domain.

I’m Jen Ruhman, a San Diego SEO expert, and I use both concepts when evaluating websites—but in very different ways.

Here’s how I think about them.

Quick Answer: Topical Authority vs. Domain Authority

Topical authority describes the depth, relevance and credibility a website develops around a particular subject.

Domain Authority is a third-party SEO metric designed to estimate the relative strength of a domain, often based heavily on backlink-related data.

Google does not provide website owners with an official “topical authority score.”

Google also does not use third-party Domain Authority scores as its ranking metric.

That’s why I don’t build SEO strategies around trying to maximize either number.

The real objective is much more important:

Relevant rankings, qualified traffic, leads and revenue.

What Is Topical Authority?

Topical authority is a useful way of thinking about how thoroughly a website covers the subjects connected to its expertise.

For example, imagine two websites publish an article about retirement planning.

One website has that single article.

The other has useful resources covering:

• Retirement income planning
• Social Security
• Required minimum distributions
• Tax-efficient withdrawals
• Estate planning
• Long-term care
• Investment allocation
• Common retirement questions

Those pages aren’t simply keyword variations.

They’re different subjects and questions that naturally belong within a broader retirement-planning topic.

Together, they create meaningful depth.

I explain this concept—and how I build it without creating unnecessary duplicate content—in my full guide to topical authority in SEO.

What Is Domain Authority?

Domain Authority is different.

The term Domain Authority is most closely associated with Moz’s proprietary SEO metric. Other SEO platforms have their own authority metrics and scoring systems.

These tools attempt to estimate the relative strength or ranking potential of websites using their own data and methodologies.

That can be useful.

I may look at third-party authority metrics when I’m:

• Comparing competitors
• Evaluating backlink profiles
• Researching link opportunities
• Identifying suspicious backlink patterns
• Prioritizing outreach

But I don’t treat the score as the goal of an SEO campaign.

A business doesn’t make money because its authority metric increased from 25 to 40.

The business benefits when SEO produces more visibility for valuable searches and ultimately contributes to leads and customers.

Is Domain Authority a Google Ranking Factor?

No.

This is probably the most important misconception to clear up.

A third-party Domain Authority score is not a Google ranking metric.

SEO platforms calculate their own metrics using their own indexes and formulas.

That doesn’t make the data useless.

It simply means you shouldn’t confuse a third-party measurement with Google’s ranking systems.

I use authority metrics as diagnostic information, not as Google’s report card for a website.

Is Topical Authority a Google Ranking Factor?

Not in the simple way people sometimes describe it.

Google doesn’t give website owners a metric called:

Topical Authority Score: 87/100

When I talk about building topical authority, I’m using the term as a framework for creating a website with strong, relevant and useful coverage around the subjects that matter to the business.

I’m looking at whether the relationships between:

services → expertise → supporting content → internal links → external authority

make sense.

That’s very different from trying to manipulate an imaginary score.

Topical Authority vs. Domain Authority: The Main Difference

Here’s the easiest way I explain it.

The distinction matters because a website can look strong according to an SEO tool while still having poor content for a particular subject.

And a smaller website can have excellent, highly relevant content even if its third-party authority metrics aren’t especially high.

What About Backlinks?

Backlinks still matter.

But “backlinks matter” and “you need the highest Domain Authority possible” are not the same statement.

When I’m evaluating links, I’m interested in things like:

• Relevance
• Credibility
• Editorial value
• Context
• Brand exposure
• Referral potential
• Authority

I’d rather earn a legitimate mention from a relevant publication, organization or industry resource than chase hundreds of low-value links simply to move a third-party score.

That’s why my approach to digital PR and link building focuses on building legitimate external authority rather than collecting links for the sake of a metric.

Can a Website Have High Domain Authority but Weak Topical Authority?

Yes.

Imagine a large established website with thousands of backlinks.

It publishes one article about a specialized subject it has barely covered before.

The strength of the domain doesn’t automatically mean that particular page is the best resource for that search.

Likewise, a smaller specialized website may have extensive first-hand expertise and excellent resources around that exact subject.

That’s why I don’t evaluate pages based on a single website-wide metric.

SEO is more complicated than that.

Can a Website Have Strong Topical Authority but Few Backlinks?

It can certainly have excellent topical coverage while having relatively little external authority.

But in a competitive search market, strong content doesn’t mean backlinks and external credibility become irrelevant.

This is why I don’t frame the strategy as:

Topical authority OR backlinks.

I want a website to develop useful depth and legitimate external authority.

The balance will vary depending on the business, competitors and search market.

Internal Links Connect Your Topical Content

Another important difference is that topical authority is heavily connected to how information is organized.

You don’t want dozens of related articles sitting in isolation.

Relevant pages should connect naturally.

Supporting content can link to important service pages.

Related educational articles can link to one another.

Case studies can connect to the services they demonstrate.

I explain the mechanics in my guide to internal linking for SEO.

The important point here is that good internal linking helps create relationships between your content instead of leaving every page on its own.

What About Topical Authority and AI Search?

AI-powered search has made topical authority a popular subject again.

But I would be careful with claims that businesses need a special “AI authority score.”

There isn’t a universal topical-authority score that guarantees your business will appear in ChatGPT, Google AI Overviews or another AI-powered search experience.

I focus instead on making a business and its expertise easy to understand through useful content, clear site structure, original information, internal linking and credible external signals.

That’s also how I approach AI SEO services in San Diego.

AI search changes some aspects of discovery, but it doesn’t make strong SEO fundamentals obsolete.

How Do I Measure Topical Authority?

Because there isn’t an official topical-authority metric, I don’t reduce it to one number.

I look at real search performance.

For example:

Are relevant queries gaining impressions?

Are supporting pages beginning to rank?

Are important commercial pages improving?

Is Google ranking the page I intended for a particular query?

Is the website gaining visibility across more of the relevant topic?

Are qualified organic leads increasing?

Those indicators tell me much more about whether the strategy is working than an arbitrary topical-authority score.

Are Domain Authority Tools Still Useful?

Yes.

The fact that Domain Authority isn’t a Google metric doesn’t make SEO tools useless.

Third-party authority metrics can be extremely helpful for competitive analysis, backlink research and identifying potential opportunities.

The mistake is turning the metric into the business objective.

If your authority score goes up but your qualified organic visibility, leads and revenue don’t improve, you haven’t necessarily accomplished much.

So Which One Should Businesses Focus On?

I don’t think businesses need to choose between them.

Instead, I focus on what each concept tells me.

Topical authority reminds me to build meaningful expertise and useful content around subjects that matter to the business.

Domain Authority and similar third-party metrics can give me additional information about the website’s relative external authority and backlink profile.

Neither should become the goal by itself.

For most businesses, the stronger strategy is to build:

useful topical depth + strong service pages + logical internal linking + relevant external authority + real expertise.

That’s much closer to how I approach SEO campaigns for clients.

Final Thoughts

Topical Authority and Domain Authority describe two very different things.

Topical authority is a framework for thinking about the depth and relevance of a website’s expertise.

Domain Authority is a third-party SEO metric used to estimate relative domain strength.

Neither is an official Google score.

And neither should distract you from what SEO is ultimately supposed to accomplish.

I care much more about whether Google understands what your business does, whether your website deserves to rank for the searches that matter, and whether that visibility produces qualified business.

If you want to learn how to build the content side of this strategy, start with my complete guide to topical authority.

And if you need help putting the entire strategy together, I work directly with businesses through my San Diego SEO company.

Get found. Get trusted. Get chosen.

— Jen Ruhman
San Diego SEO Expert

Frequently Asked Questions

What is the difference between topical authority and Domain Authority?

Topical authority is an SEO concept describing a website’s depth and credibility around a particular subject. Domain Authority is a third-party metric designed to estimate the relative strength of a domain.

Is Domain Authority a Google ranking factor?

No. Domain Authority is a third-party SEO metric, not an official Google ranking metric.

Is topical authority a Google ranking factor?

Google doesn’t publish an official “topical authority” score. It’s better understood as an SEO framework for building useful, relevant depth around subjects connected to a website’s expertise.

Can a low Domain Authority website outrank a high Domain Authority website?

Yes. Third-party authority scores don’t determine Google’s rankings. Google uses many signals when determining which pages to show for a search.

Do backlinks still matter?

Yes. Links remain an important part of SEO, but they should be considered alongside content quality, relevance, technical SEO, internal linking, site structure and other factors.

Should I focus on topical authority or Domain Authority?

Don’t treat either as the sole objective. Build useful topical depth while also developing legitimate external authority, and measure success using meaningful SEO and business outcomes.