Keyword difficulty (KD) is an SEO metric that estimates how hard it is to rank a page on the first page of Google for a specific keyword. It is also called keyword competition or SEO difficulty, and most SEO platforms score it from 0 to 100.
A keyword can have strong search volume and still be a poor target if the pages already ranking for it are far stronger than yours. This guide covers how the score is calculated, what counts as a good score, and how to use it to choose keywords your site can win.
What Is Keyword Difficulty (KD)?
Keyword Difficulty is an SEO metric that estimates how hard it is to get your website onto the first page of Google for a particular keyword.
Google does not publish keyword difficulty scores. SEO platforms such as Ahrefs, Semrush, and Search Atlas calculate their own, usually on a 0 to 100 scale, where a higher score means stronger competition.
A high KD score means you’re up against well-established websites with a strong backlink profile. A lower score suggests it is easier to climb the rankings.
Because each platform uses its own formula, the same keyword gets different scores in different platforms. Many SEO professionals treat keyword difficulty as a general concept rather than a fixed number.
In this broader sense, ranking difficulty takes multiple factors into account (domain power, content relevance, search intent).
How Is Keyword Difficulty Calculated?
Keyword difficulty is calculated from the strength of the pages that already rank in the top 10 for a keyword, and each platform measures that strength differently. The two most-cited formulas show the range:
| Platform | Scale | What the score is based on |
|---|---|---|
| Ahrefs | 0 to 100 | The number of referring domains pointing to the top 10 organic results. On-page factors are not included. |
| Semrush | 0 to 100% | The median referring domains of the ranking URLs, their dofollow/nofollow link ratio, the median Authority Score of the ranking domains, and SERP qualities of the keyword. |
Sources: Ahrefs Help Center and Semrush Knowledge Base, checked September 29, 2026.
Because the inputs differ, a keyword can score 20 in one platform and 40 in another. Compare scores inside one platform, not across platforms.
What Is a Good Keyword Difficulty Score?
A good keyword difficulty score is one your site can realistically reach with the authority and backlinks it has today. For a new site with few referring domains, that usually means scores in the lowest bands; an established site can compete for higher scores.
Semrush publishes named bands for its KD% scale:
| KD% | Semrush label |
|---|---|
| 0–14 | Very easy |
| 15–29 | Easy |
| 30–49 | Possible |
| 50–69 | Difficult |
| 70–84 | Hard |
| 85–100 | Very hard |
Ahrefs instead ties each score to an estimated number of referring domains a page needs to reach the top 10. The scale is not linear: KD 10 corresponds to about 10 referring domains, KD 40 to about 56, KD 60 to about 129, and KD 90 to about 756 (Ahrefs).
To judge whether a score is good for you, compare it with your own pages. If your strongest pages have 20 to 30 referring domains, keywords that need 50 or more are long-term targets, not quick wins.
What Factors Affect Keyword Difficulty in SEO?
Keyword difficulty reflects how competitive a search term is in organic results. The factors below raise or lower that competition, though each platform includes only some of them in its score.
- Backlinks to Top-Ranking Pages. Backlink profiles determine how much authority search engines assign to a page. High numbers of quality referring domains increase trust. Follow links strengthen this effect.
- Authority Scores of Top-Ranking Sites. Top results with high authority raise keyword difficulty.
- Keyword Search Volume. Search volume signals demand. Neither the Ahrefs nor the Semrush formula uses volume directly, but high-volume terms attract more publishers, which raises the strength of the pages you compete with.
- Presence of SERP Features. SERP features reduce organic visibility. Elements like featured snippets and People Also Ask boxes push standard listings down. Greater interference from features increases difficulty.
- Brand Name Keywords. Brand terms favor official websites. Search engines give preference to pages that match the brand. Competing for these terms without representation raises difficulty.
- Search Term’s Word Count. Keyword length affects specificity. Longer phrases match narrower intent and receive fewer searches. Long-tail keywords reduce difficulty and reflect clearer user goals.
Why Does Keyword Difficulty Matter in SEO?
Keyword difficulty matters because it tells you how much content, link building, and time a keyword will need before it can rank.
Competition Level
Keyword difficulty and competitor keyword research work together to help you assess how tough it is to rank for specific keywords.
The websites on the first page determine the competition level. High-authority websites in the first SERP require stronger backlinks and more in-depth content to compete. Lower-authority sites on the first SERP do not require such a strong backlink profile and content. Lower-authority websites ranking in the first SERP present an opportunity to break in with well-optimized content.
Search Atlas Keyword Gap compares up to 6 domains, your site and up to five competitors, on search volume, position, intent, difficulty, and traffic potential. That shows which keywords competitors rank for and which of those have a difficulty your site can reach.
Keyword Gap sorts the results into five views.
- Keyword Gap. Keywords your competitors rank for and you don't. These are candidates for new content.
- Keywords in Common. Keywords all the compared sites rank for. Useful for seeing where you trail.
- Keyword Opportunities. Keywords at least one competitor ranks for and you don't.
- Unique Keywords. Keywords only you rank for.
- All Keywords. Every keyword any of the compared sites ranks for.
Organic competitor comparison in Search Atlas.
Priorities
Keyword difficulty sorts keywords by the effort they need, which makes it a planning input as much as a ranking estimate.
- Easy keywords. Low competition. A single well-targeted post can rank without new backlinks.
- Medium-difficulty keywords. Medium competition. These need thorough content and a few supporting links.
- High-difficulty keywords. Contested by strong sites. Ranking takes in-depth content, sustained link building, and time to build site authority.
Content Strategy
Keyword difficulty decides the order of a content plan. Lower scores are the entry points; high scores need authority the site builds over time.
When a weak site ranks for a high-difficulty keyword, content quality or intent match is outweighing backlinks for that query.
A mix of easy, moderate, and competitive terms lets early wins bring traffic while the site builds the authority the harder terms need.
The Search Atlas Topical Map Generator turns a seed keyword into pillar and supporting clusters. Each cluster shows its search volume and a ranking-potential label, as in the screenshot above, so you can mix easy and competitive clusters in one plan.
Link Building
High-difficulty keywords need strong backlinks. Before you target one, compare the referring domains of the top 10 pages with your own, then close the gap through outreach, guest posting, and internal linking.
Search Atlas link building outreach finds publishers, sends the pitch sequence and follow-ups, tracks replies, and ties each placement back to your backlink profile. WILDFIRE, the Search Atlas link exchange network, trades two outbound links for one inbound link, and Press Release Distribution adds syndicated coverage.
Time and Resources
When a keyword difficulty score doesn't match what you expect, check the SERP before you commit resources.
Imagine you’re planning to write about “best home workout routines.” You assume it’ll be competitive, but the difficulty score is surprisingly low. That seems like an easy win, but ask yourself why.
The SERP may be full of YouTube videos, so articles rarely get the click. A low score does not account for that.
6 Questions to Ask When Assessing Keyword Difficulty
A keyword difficulty score is a starting point. These six questions test whether your site can compete for the keyword.
1. Who Are You Competing Against?
The pages in the top 10 set the real difficulty, so review them directly.
- Content Quality. Is their content detailed, well-written, and engaging?
- On-page Optimization. Are they using SEO best practices like keyword placement, internal linking, and structured data?
- Backlinks. Count the referring domains of the top pages and compare them with your own.
2. How Strong Is Your Website?
Your site authority matters even if a keyword looks easy.
- A new website with no backlinks struggles to rank even for low-competition keywords.
- An established website with solid authority can target harder keywords and still compete.
Third-party metrics such as Domain Authority (Moz), Domain Rating (Ahrefs), and Trust Flow (Majestic) give a rough idea of a site's strength. Each measures different inputs, so their scores differ; see Domain Rating vs. Domain Authority for how two of them compare.
Google does not use any of these metrics. Search Atlas Domain Power is a 100-point logarithmic authority metric built from organic traffic, keyword performance, and ranking distribution across the top 100 results, rather than from link graph size alone. In a Search Atlas study of 350,159 backlink placements across 13,002 pages, Domain Power predicted page-level ranking outcomes better than Domain Authority or Domain Rating.
Correlation of Domain Power and other authority metrics with organic traffic and keyword rankings.
3. What Is the Best Length?
Short, broad keywords (“running shoes”) are usually highly competitive. Long-tail keywords (“best running shoes for beginners”) are usually easier to rank for and attract more targeted traffic.
Since long-tail keywords are more specific, they often have the two characteristics listed below.
- Lower Competition. Fewer big sites compete for them.
- Higher Conversion Rates. Searchers already know what they want.
If high-difficulty keywords are out of reach, long-tail keywords on the same topic are the usual alternative.
4. Can SERP Features Make It Harder to Rank?
The search results page layout can make ranking harder regardless of difficulty score.
- Featured snippets take clicks from the organic results below them.
- Ads push organic listings further down.
- Other rich results (like “People Also Ask” or local packs) often reduce visibility.
Check what the SERP looks like before targeting a keyword. Even a low-difficulty keyword might not be worth chasing if the top of the page is crowded with non-organic results.
5. Is Your Content Good Enough?
Your page has to be better than the pages already ranking. Before targeting a keyword, answer three questions.
- Can I create content that’s more useful or more in-depth?
- Do I have a unique angle, better research, or original insights?
- Can I add visuals, data, or expert opinions to make my content stand out?
If the top pages answer the query better than your page can, a low difficulty score will not help.
Search Atlas SCHOLAR grades your page and the pages already ranking for the keyword across 12 dimensions: Overall Score, Content Clarity, Factuality, Human Effort, Information Gain, Content Freshness, User Intent, Entity Score, Contextual Flow, Numerical Content, Query Relevance, and Readability. A low Information Gain or User Intent score against the ranking pages is a sign the keyword will be harder than its difficulty score suggests.
SCHOLAR grades your pages and competitor pages.
6. Does Your Content Match Search Intent?
Google ranks content that matches what searchers want, whatever its quality. Check the format of the top results (guides, product pages, videos, tools) and match it before you judge the difficulty score.
Visualizing buyer intent through the AIDA funnel, from awareness to action, with Search Atlas as your strategic guide.
How Do You Check Keyword Difficulty in Search Atlas?
Search Atlas Keyword Research shows keyword difficulty for every keyword in a 5.2 billion+ keyword database, next to search volume, CPC, and traffic potential. Each score carries a label, such as Easy, with a short note on which sites can likely rank, as in the dog training screenshot earlier in this guide.
The SERP Overview then shows why the score is what it is. For each ranking page it lists Domain Rating, Domain Authority, backlinks, page referring domains, ranking keywords, and organic traffic.
A low-authority page in the top 10 is a signal that content quality or intent match is outweighing links for that keyword, which makes it a better target than the score alone suggests.
The same approach works at the site level. A longevity and science website that worked with Search Atlas grew monthly organic traffic from 2,777 to 34,677 visitors (+1,149%) and organic keywords from 2,843 to 8,058 (+183%) in 9 months. Its top 3 rankings rose from 132 to 339 keywords.
The graph illustrates an increase in organic keywords and traffic from August 2022 to July 2023, with key data points in October 2022 and May 2023. This trend aligns with growing interest in aging research during that period.
How to Use Keyword Difficulty in Your Keyword Strategy
Use keyword difficulty to shortlist, then confirm each keyword against the live SERP. Links still set the baseline, but the traffic, topical depth, and intent match of the ranking pages explain why they rank where they do. Some in the industry argue the metric itself needs rethinking; see why some say keyword difficulty is dead.
Search Atlas offers a 7-day free trial with full platform access, including a 30-minute onboarding session.
