Understanding Ahrefs Metrics: Complete Guide to SEO Metrics & Terminology

Are you confused by the SEO metrics and abbreviations you see inside Ahrefs? If the answer is YES, then this guide is for you.

After years of working with Ahrefs, I’ve seen many SEO beginners feel overwhelmed by the large number of metrics inside the platform. In this article, I’ll explain what these metrics mean and how to use them effectively.

The truth is, SEO metrics are not as complicated as they look. Most of them are actually very easy to understand once you know how they work.

Below are the Ahrefs metrics covered in this guide:

  • Keyword Search Volume
  • Return Rate (RR)
  • Clicks
  • Cost Per Click (CPC)
  • Keyword Difficulty (KD)
  • Organic Keywords
  • Organic Traffic
  • Traffic Value
  • URL Rating (UR)
  • Domain Rating (DR)
  • Ahrefs Rank (AR)

Keyword Search Volume

This metric shows the average number of times people search for a keyword each month in a specific country.

Inside Google Keyword Planner, this is called “Average Monthly Searches.”

In many SEO tools, including Ahrefs, “Search Volume” is often shortened to simply “Volume.”

One important thing to understand is that search volume refers to the number of searches, not the number of people searching.

For example, two people could each search for the keyword “flight tickets” 100 times in a month. That would create a total search volume of 200 searches from only two users.

Another important part of the definition is the word “average.”

Search demand changes constantly throughout the year.

For example, the keyword “Christmas gifts” usually spikes in December and drops sharply in January.

Most SEO tools calculate search volume using the average monthly searches from the last 12–24 months. Because of this, there is no exact way to know how many searches a keyword will receive in the next 30 days.

When using Keywords Explorer in Ahrefs, always make sure you select the correct country database before analyzing keywords.

Frequently Asked Question

Question:
“Why is the search volume in Ahrefs different from Google Keyword Planner or other SEO tools like KeywordTool.io? Is this a bug?”

Answer:
No. This is intentional.

Ahrefs uses Google Keyword Planner as a base data source, then combines it with clickstream data to calculate its own refined monthly search volume estimates.

Return Rate (RR)

Return Rate (RR) shows how often the same person searches for a keyword again within a 30-day period.

  • RR1 means users usually do not search for the keyword again within 30 days.
  • RR2 or RR3 does not literally mean people search two or three times per month. It simply means the keyword receives more repeat searches compared to lower RR keywords.

For example:

  • “World Cup” and “Bitcoin price” may both have RR values above 2, meaning users frequently search these terms repeatedly.
  • “Facebook” often has a much higher RR because many users search for Facebook directly on Google instead of typing the URL into their browser.

Return Rate is a unique metric available only in Ahrefs.

Clicks

Google now displays many SERP features such as:

  • Featured snippets
  • Google Suggest
  • Knowledge panels
  • Instant answers

Because of this, the number of searches and the number of clicks are no longer the same.

For example, a keyword may receive 78,000 searches per month but generate 94,000 clicks because users click multiple search results.

On the other hand, some keywords generate very few clicks despite high search volume.

For example, if you search “How old was Trịnh Công Sơn?”, Google immediately displays the answer inside the search results. Users often get their answer without clicking any website.

This is known as a “zero-click search.”

Ahrefs also estimates how clicks are divided between:

  • Organic results
  • Paid ads

Since Ahrefs processes massive amounts of clickstream data, it can estimate the percentage of paid vs. organic clicks for each keyword.

Cost Per Click (CPC)

CPC shows the average price advertisers pay for one click in Google Ads for a specific keyword.

CPC values constantly change because advertisers increase or decrease their bids over time.

That’s why Ahrefs recommends using Google Ads Keyword Planner if you need the most accurate and up-to-date CPC data.

The CPC numbers inside Ahrefs are averages and should only be used as reference estimates.

You may sometimes notice that the CPC shown in Ahrefs looks much lower than the actual advertising cost when running Google Ads campaigns.

This happens because Google Ads operates as a real-time auction system.

Keyword Difficulty (KD)

Keyword Difficulty (KD) is one of the most misunderstood SEO metrics.

Ahrefs calculates KD by analyzing the backlink profiles of the current top 10 ranking pages for a keyword.

The final score is displayed on a logarithmic scale from 0–100.

Important: Ahrefs mainly calculates KD using backlinks only.

This means KD estimates how many referring domains you may need to rank in Google’s top 10 results.

However, backlinks are not the only ranking factor.

Google also considers:

  • User behavior
  • Search intent
  • Content quality
  • Page experience
  • Dwell time
  • Topical authority

Think of KD like height in basketball.

Taller players often have an advantage, but height alone does not guarantee success.

Similarly, a keyword with high KD can still be ranked if your content quality and search intent optimization are strong enough.

KD should be treated as a reference metric, not an absolute decision-maker.

Frequently Asked Question

Question:
“How accurate is Ahrefs KD compared to other SEO tools?”

Answer:
Ahrefs KD is relative, not absolute.

Different SEO tools use different algorithms and ranking factors, so KD scores cannot be directly compared across platforms.

Organic Keywords

When you enter a domain into Ahrefs Site Explorer, Ahrefs shows how many keywords the website ranks for in Google’s organic search results.

Ahrefs checks whether your site ranks in the top 100 search results for keywords inside its database.

Although Ahrefs has a massive keyword database, it still cannot track every search query people type into Google.

Google itself reports that a large percentage of daily searches are completely new queries that have never been searched before.

This means the actual number of keywords your website ranks for is almost always higher than the number reported by Ahrefs.

Ahrefs also regularly updates its keyword database by:

  • Adding new search queries
  • Removing keywords with very low search demand

Because of this, your Organic Keywords count may increase even if your rankings stay the same.

Organic Traffic

Organic Traffic estimates how many monthly visitors a website receives from Google’s organic search results.

Ahrefs calculates this by:

  1. Finding all keywords the website ranks for
  2. Estimating click-through rates
  3. Calculating estimated traffic per keyword
  4. Combining all estimated traffic values together

This is why Ahrefs traffic numbers often differ from Google Analytics.

Ahrefs uses estimation models, while Google Analytics measures actual visitor data.

For example:

Two keywords may both rank #1 in Google, but one keyword can generate significantly more traffic because it has a higher click-through rate.

Organic Traffic inside Ahrefs should always be treated as an estimate.

However, it remains extremely useful for competitor analysis and SEO benchmarking.

Traffic Value

Traffic Value estimates how much a website’s organic traffic would cost if purchased through Google Ads.

For example:

  • A keyword generates 14,000 organic visits per month
  • The CPC is $0.06

Estimated traffic value:

14,000 × $0.06 = $840

Ahrefs performs this calculation across all ranking keywords and combines the results into a total Traffic Value estimate.

Again, this is only an estimate because:

  • CPC constantly changes
  • Google Ads prices fluctuate
  • Traffic calculations are estimated

Traffic Value is best used for comparison purposes rather than financial forecasting.

URL Rating (UR)

URL Rating (UR) measures the strength of a page’s backlink profile on a scale from 0–100.

UR considers:

  • External backlinks
  • Internal links
  • Link authority distribution
  • Nofollow attributes

The scale is logarithmic, meaning:

  • Growing from UR20 to UR30 is relatively easy
  • Growing from UR70 to UR80 is much harder

UR strongly correlates with Google rankings because stronger backlink profiles often lead to better rankings.

If you are familiar with Google PageRank, UR works in a very similar way.

Domain Rating (DR)

Domain Rating (DR) measures the strength of an entire website’s backlink profile.

DR is also calculated on a logarithmic scale from 0–100.

The purpose of DR is to estimate the overall “link popularity” of a domain.

This makes DR useful when evaluating backlink opportunities.

Generally:

  • Links from high-DR websites are often more valuable
  • High-DR sites usually have stronger pages overall

However, low-DR websites are not automatically bad or toxic.

A low-DR site can still have highly valuable pages and relevant backlinks.

Frequently Asked Question

Question:
“Why is my DR much higher or lower than my UR?”

Answer:
Because DR and UR measure different things.

  • DR measures the backlink strength of the entire domain
  • UR measures the backlink strength of a specific page

Ahrefs Rank (AR)

Ahrefs Rank (AR) ranks websites globally based on the strength of their backlink profiles.

For example:

  • Rank #1 = strongest backlink profile
  • Rank #2 = second strongest backlink profile
  • And so on

Historically, websites like Facebook, YouTube, and X (Twitter) have dominated the top rankings.

Frequently Asked Question

Question:
“Why is my backlink profile growing but my Ahrefs Rank is dropping?”

Answer:
Because other websites may be gaining backlinks faster than your site.

Link Indexes: Live, Recent & Historical

Inside Site Explorer, Ahrefs provides three backlink indexes:

  • Live
  • Recent
  • Historical

Live Index

Contains backlinks currently detected as active.

Recent Index

Contains backlinks that disappeared within the last 90 days.

Historical Index

Contains all backlinks Ahrefs has ever discovered.

This helps SEO professionals track:

  • Lost backlinks
  • Recovered links
  • Historical link growth

Why Do Ahrefs Metrics Sometimes Differ Across Features?

You may notice different DR or backlink counts between:

  • Site Explorer
  • Content Explorer
  • Keywords Explorer

This happens because each tool uses different databases and caching systems.

For example:

  • Content Explorer uses the content database
  • Keywords Explorer uses the keyword database
  • Site Explorer uses backlink and SERP databases

Cached metrics may not always perfectly match live data.

Final Thoughts

These are the core Ahrefs metrics most SEO professionals use every day.

Understanding these numbers helps you:

  • Analyze competitors
  • Research keywords
  • Evaluate backlinks
  • Estimate traffic potential
  • Improve SEO decision-making

I hope this guide helps you better understand how Ahrefs works and how to interpret its SEO data more effectively.

If you still have questions about any Ahrefs metric, feel free to ask.