Domain authority

Domain Authority is a ranking-likelihood metric published by the SEO tool vendor Moz itself. It scores domains from one to one hundred, with higher values signalling stronger ranking ability. Moz states that the figure is no direct ranking factor inside Google search algorithms.¹ Sellers quote the metric in catalogue tiers, and buyers use it as a rough comparison guide.

Definition

Moz defines Domain Authority as a prediction of how likely a site is to rank against competitors.¹ The scale runs from one to one hundred, with higher values indicating greater ranking ability.¹ Moz frames the figure as comparative, meaning it benchmarks one site against others in a market.¹ Strong inbound links, off-page work, and valuable pages typically accompany high values, according to Moz. The figure comes from Moz link-index data rather than from any search-engine feed at all. Values shift as Moz refreshes its index, so dated observations matter more than remembered numbers. The figure counts as a vendor estimate rather than as a search-engine measurement. A new or small site scores low by construction, whatever the quality of its pages. Vendors present such metrics as prospecting aids, and buyers treat them as rough guides only. Scores compress huge link-graph differences into a compact scale, which aids quick side-by-side comparison.

Ranking ability means the predicted likelihood of appearing prominently in search results for queries. A link index is the vendor crawl database from which third-party metrics are computed. Off-page signals are ranking inputs earned outside the site itself, principally through inbound links. These terms recur across metric documentation, seller catalogues, and provider articles.

Calculation and inputs

Moz builds the score from backlink signals observed across its own extensive web index. Linking-domain counts and the quality of those links feed the published model behind the score. The published page explains what the score means rather than printing its full arithmetic. Because the figure is relative, movements elsewhere in the index can shift a steady site. Buyers read sudden shifts as index artefacts as often as genuine changes in link strength. Sellers rarely name the index date behind a quoted value, which weakens undated comparisons. Provider articles therefore date every quoted figure and name the tool that produced it. Cross-tool comparison needs care, since each vendor computes scores from its own observed index.

A worked example shows how the inputs combine without stating any exact vendor arithmetic. A domain gaining links from several well-connected sites with relevant content tends to rise steadily. The same count of links from isolated pages with little standing contributes far less. Losing a small number of strong donors can outweigh gaining many weak ones over a period. Because the figure is comparative, rivals gaining links can lower a steady site without any change. Buyers treat all such reasoning as directional, since the vendor model itself remains only partly described.

Use in seller tiers

Sellers commonly group publisher inventory into price bands by Domain Authority for catalogue display. Listings pair each band with a price, so higher bands normally carry higher price tags. Buyers filter catalogues by a minimum value, which sellers call an authority floor in offers. Floors simplify comparison across sellers, since one single number replaces a full backlink inspection. The convenience explains the metric grip on pricing, even where its limits are well known. Some sellers guarantee a minimum value at delivery, with replacement cover when placements fall short. Stated floors are recorded and samples checked against them during each scoring round. The methodology page describes how this is graded for each provider in every round.

Stated floors appear in several catalogue forms with different implications for buyers assessing offers. A minimum-value promise states the lowest acceptable figure at the point of delivery exactly. A band label groups publishers into ranges, hiding individual variation within each stated range. A sample-based claim cites checked placements rather than the whole catalogue behind the offer. Buyers distinguish these forms because each carries different evidential weight during later payment disputes. The methodology page describes how such evidence is graded for each provider in every scoring round.

How providers sell it

Metric tiers form the pricing backbone of most paid link catalogue structures in use today. Catalogue entry bands offer lower-rated publishers at correspondingly lower prices per single placement unit. Mid bands promise stronger donor profiles with higher traffic estimates alongside the metric figure. Upper bands command the highest prices and often include extended content and longer replacement cover. Marketplace filters let buyers set a minimum value and browse only matching publisher listings.

A standard tiered offer generally includes the placement, content drafting, reporting, and a minimum-value promise. Attribute defaults and anchor control vary by band, with stricter publisher terms at higher levels. Common exclusions include traffic guarantees, indexation promises, and specific ranking outcomes for target pages. Replacement cover applies when delivered placements fall below the promised floor after publication completes. Buyers confirm whether the floor describes the domain at order or at delivery, since values drift.

Limits as a quality proxy

The metric summarises link signals alone, while traffic and relevance always need separate inspection. Manipulated link profiles can inflate the value, since scores count links without judging intent. Expired domains repurposed for links may carry inherited strength that flatters their current quality. Moz itself positions the figure for competitor benchmarking rather than for absolute quality claims.¹ A high value never proves editorial standards, real readership, or topical fit for a client. Both Moz and Ahrefs metrics come from vendors rather than from search engines themselves. Different vendors therefore assign different values to the same domain without either being wrong. Buyers treat the number as a screening filter and inspect traffic and content before paying.

Engineered link profiles exploit exactly this gap between metric scores and publisher quality levels. A domain can accumulate a high figure through coordinated links while hosting thin commercial content. Readership signals such as traffic estimates and genuine engagement expose the difference very quickly. Published editorial standards, author bylines, and outbound-link discipline provide further qualitative checks for buyers. The metric screens catalogues efficiently, but it never replaces inspection of the publisher itself.

Comparison with Domain Rating

Domain Rating is the counterpart metric from Ahrefs, scored on a logarithmic vendor scale.² Ahrefs describes it as the strength of a website backlink profile across the whole domain.² Its logarithmic shape means each further point toward the top represents a larger underlying gap.² Both scales run upward with strength, but their inputs and arithmetic differ between the two vendors. Values for one domain rarely match across the two tools, which confuses buyers comparing offers. Which metric each stated floor uses is recorded, since the two numbers are not interchangeable. The Domain Rating article covers the Ahrefs metric in matching detail.

The conceptual difference between metrics matters for catalogue reading across many different competing sellers. Domain Authority frames itself as comparative ranking likelihood against competing pages in search results. Domain Rating emphasises overall backlink profile strength exactly as observed in vendor crawl data. Neither figure comes from a search engine, and neither acts as a ranking factor itself. Buyers comparing offers across metrics therefore recheck traffic and relevance rather than converting numbers arithmetically.

How to verify it

Any auditor can recheck a stated metric figure through public vendor tools directly online. Entering the publisher domain into the vendor checker returns the current figure for direct comparison. The comparison needs the same tool, since different vendors compute different values for one domain. Dated screenshots prove the figure at order time, because values drift between successive index refreshes. Traffic estimates from the same tools provide the readership half of the assessment process.

Delivery checks compare the promised floor against each delivered publisher at publication time exactly. The placement report supplies the live locator for each delivered link in the order. The auditor enters each publisher domain into the checker and records the observed figures. Shortfalls against a guaranteed floor trigger the replacement terms stated on the terms page. Reports without locators or dates resist such checking, and thin reporting itself informs the assessment.

Risks and search-engine policy

Google defines link spam as creating links mainly to manipulate rankings rather than to serve readers.³ Chasing metric tiers can push buyers toward paid links that breach that definition when unqualified. Paid links need qualification with nofollow or sponsored attributes on the anchor tag itself. Google may apply manual actions against sites whose link schemes it confirms through review. Metric-obsessed buying also funds low-value content built primarily to manipulate linking and ranking signals. Expired-domain abuse draws explicit attention in the same policy when old domains host unrelated commercial content. Free lookup tools publish the figure widely, which entrenches it in catalogue conventions everywhere. Buyers therefore weigh editorial context and traffic evidence before trusting any single vendor number.

Common misconceptions

• A higher figure always means a stronger placement. The metric summarises link signals only, while page relevance, traffic, and markup decide the placement value.
• The figure comes from Google. It comes from a commercial vendor index, and search engines publish no equivalent domain score for buyers.
• Small sites cannot host useful links. New domains score low by construction, yet their editorial relevance and readership can still serve campaign goals.
• The two vendor metrics are interchangeable. Their inputs and arithmetic differ, so one domain rarely scores identically across both tools.
• Metric tiers replace publisher inspection. Tiers screen catalogues efficiently, but traffic, content standards, and outbound discipline need direct checking before payment.

Terminology

A referring domain is a separate domain containing at least one link to the measured site. A metric floor is the minimum stated value for a placement at the point of delivery. Ranking ability is the predicted likelihood of appearing prominently in search results for queries. A vendor estimate is any figure computed by a tool company rather than by a search engine. An authority floor is the seller promise version of a metric floor, tied to replacement cover. Off-page signals are ranking inputs earned outside the site itself, principally through inbound links. A link index is the vendor crawl database from which third-party metrics are computed.

A manual action is search-engine enforcement applied after human review confirms a link scheme.³ A band label groups publishers into metric ranges, hiding individual variation within each range. A donor is any linking domain passing a share of its own standing onward. An index artefact is an apparent metric shift caused by vendor refreshes rather than genuine link changes. A lookup tool is any public checker returning vendor metric figures for entered domains.

Frequently asked questions

What is Domain Authority in SEO?

Domain Authority is a ranking-likelihood metric published by the SEO tool vendor Moz itself. It scores domains from one to one hundred, with higher values signalling stronger ranking ability. Moz states that the figure is no direct ranking factor inside Google search algorithms.¹ The figure counts as a vendor estimate rather than a search-engine measurement.

How is Domain Authority calculated?

Moz builds the score from backlink signals observed across its own extensive web index. Linking-domain counts and the quality of those links feed the published model behind the score. The published page explains what the score means rather than printing its full arithmetic. Because the figure is relative, movements elsewhere in the index can shift a steady site.

What is a good Domain Authority for link building?

No single threshold suits every campaign, since relevance and traffic matter alongside the figure. Sellers organise catalogues into bands, and buyers select bands matching their budgets and goals. Higher catalogue bands normally carry higher prices with stricter publisher terms attached as standard. Careful buyers always inspect traffic and content before paying, whatever catalogue band they consider.

Does Google use Domain Authority for ranking?

Moz states plainly that the figure is no direct ranking factor inside Google search algorithms.¹ Search engines publish no equivalent domain score for buyers to check against publicly anywhere. The metric serves competitor benchmarking and catalogue comparison rather than any direct algorithmic input. Buyers treat it as a screening filter rather than as proof of publisher quality.

How does Domain Authority differ from Domain Rating?

Domain Authority is the Moz metric predicting comparative ranking likelihood from one to one hundred. Domain Rating is the Ahrefs metric of backlink profile strength on a logarithmic vendor scale.² Their inputs and arithmetic differ, so one domain rarely scores identically across both tools. Which vendor metric each stated floor uses is recorded in every scoring round.

Can Domain Authority be manipulated?

Engineered link profiles can inflate the value, since scores count links without judging intent. Expired domains repurposed for links may carry inherited strength that flatters their current quality. Traffic estimates and editorial inspection together expose the gap between metric and publisher standards. Buyers treat the number as a screening filter rather than as proof of quality.

Why do sellers organise catalogues by Domain Authority?

A single number simplifies comparison across sellers and lets buyers filter listings very quickly. Bands pair each strength level with a price, so higher bands normally cost more per placement. That convenience explains the strong metric grip on catalogue pricing despite its well-known limits. Stated floors are recorded and placement samples checked against them in each round.

See also

• Domain rating
• Referring domains
• Organic traffic floors
• Link building
• Backlink profile
• Best high authority link services
• Methodology