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Last updated: October 29, 2026
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Keyword Difficulty (2027): What KD Means and How to Use It
Keyword difficulty (KD) is a score, usually from 0 to 100, that estimates how hard it is to reach the first page of Google for a keyword. SEO tools calculate it mostly from the strength of the pages and sites already ranking, especially their backlinks. A low score suggests a newer site has a chance; a high score means you'll compete with strong, well-linked pages. KD is an estimate, so use it to sort ideas, then look at the actual results before you commit.
- Scale: 0 to 100 in Semrush, Ahrefs, Moz and SE Ranking.
- Based mainly on the links and authority of the pages in the top 10.
- Each tool calculates it differently; the same keyword gets different scores.
- Compare KD with your own site's authority, not with a fixed rule.
- Always check the search results by hand before writing.
How SEO tools calculate keyword difficulty
| Tool | Name | What it mainly looks at |
|---|---|---|
| Semrush | Keyword Difficulty (%) | Authority and links of the ranking domains and pages, plus SERP features |
| Ahrefs | Keyword Difficulty (KD) | How many referring domains the top 10 pages have |
| Moz | Difficulty | Page and domain authority of the ranking results |
| SE Ranking | Keyword Difficulty | Authority and links of the top results |
Because the inputs differ, a keyword might show 40 in one tool and 25 in another. Stick to one tool so your comparisons stay consistent.
What the scores mean
Semrush groups its scores roughly like this:
| KD | Label | Practical meaning |
|---|---|---|
| 0 to 14 | Very easy | Good targets for new sites |
| 15 to 29 | Easy | Reachable with solid content |
| 30 to 49 | Possible | Needs strong content and some links |
| 50 to 69 | Difficult | Needs authority and links to compete |
| 70 to 84 | Hard | Strong domains dominate |
| 85 to 100 | Very hard | Major sites own these results |
Other tools use similar bands with different labels. Treat them as guides rather than rules.
How to use keyword difficulty
- Find your own authority score in the same tool (see domain authority).
- Start with keywords whose difficulty is close to or below what your site can handle.
- Balance difficulty with search volume and business value.
- Open the search results and check who ranks: big brands, forums, small blogs, product pages.
- Look at search intent: do the top results match the page you plan to write?
- Plan a few harder keywords for later, once your site has more authority.
A simple scoring method
Give each keyword a score out of 10 for three factors and add them up:
| Factor | High score when |
|---|---|
| Business value | Searchers could become customers |
| Reachability | KD is low for your site and weaker sites rank |
| Demand | Monthly volume is meaningful for your niche |
| Keyword (example) | Value | Reach | Demand | Total |
|---|---|---|---|---|
| best crm for freelancers | 9 | 7 | 5 | 21 |
| what is a crm | 5 | 3 | 9 | 17 |
| crm | 7 | 1 | 10 | 18 |
The broad keyword has the most demand but the lowest chance; the specific one wins overall. These numbers are illustrations; score your own list.
Signs a keyword is easier than its score
- Forums, Reddit threads or Q&A sites rank on page one.
- Results are old or don't answer the question well.
- Small sites with few links rank in the top five.
- The search intent is narrow and big sites cover it only briefly.
Signs it's harder than its score
- The whole first page is major brands or government sites.
- Google shows many SERP features (AI Overviews, video, shopping) above the results.
- The intent doesn't match your page type, for example people want a tool, not an article.
Long-tail keywords
Longer, more specific phrases usually have lower difficulty and clearer intent. "Email marketing" is very competitive; "email marketing for small online stores" is narrower, easier and often closer to a purchase. New sites grow fastest by covering long-tail topics well and linking them together. See how to do keyword research.
Keyword difficulty tools compared
| Tool | Free option | Entry paid price |
|---|---|---|
| Semrush | Free plan with daily limits | SEO Toolkit $117.33/month (annual), $139 monthly |
| Ahrefs | Free keyword generator (limited) | Starter $29/month, Lite $129/month |
| SE Ranking | Trial | Core $103.20/month (annual), $129 monthly |
| Moz Pro | Limited free keyword research | Standard $99/month, $79 on annual billing |
Semrush has the largest keyword database for most markets; SE Ranking costs less if you also want rank tracking and audits; Moz's free searches cover occasional checks.
Check keyword difficulty in Semrush → Free plan, no card needed · Affiliate link
Keyword difficulty and AI search
AI Overviews and other answer features now sit above many informational results, so a keyword can be easy to rank for but send fewer clicks. Check the live results for answer boxes and weigh that in your choice, especially for simple definitions.
Common mistakes
- Avoiding every keyword above a fixed number, whatever your site's strength.
- Comparing KD across different tools.
- Choosing keywords only because they're easy, with no business value.
- Skipping the manual check of the search results.
- Writing one page for many keywords with different intents.
Terms explained
- KD: keyword difficulty, an estimate of ranking difficulty.
- SERP: search engine results page.
- Search intent: what the searcher wants to find.
- Long-tail keyword: a longer, more specific search phrase.
- SERP features: elements like featured snippets, videos and AI answers.
Building authority to target harder keywords
Cover a topic cluster thoroughly: start with easier long-tail pages, link them to a central guide, and earn links to the guide. As the cluster ranks, harder head terms become reachable. See what is a backlink.
Difficulty and content quality
Even with a low difficulty score, a thin page won't rank. Compare the depth, examples and freshness of the top results, and plan a page that does clearly better.
Example: choosing between two keywords
A new site compares "project management software" (very hard, huge volume) with "project management software for small agencies" (much easier, smaller volume, clearer intent). The second is the better first target: the site can realistically rank, visitors are closer to choosing a tool, and the page can later support the broader topic through internal links.
Our verdict
Keyword difficulty is a fast way to filter keyword ideas, not a verdict. Compare it with your own site's authority, weigh it against business value and volume, and always look at the actual results before writing. New sites do best with specific long-tail topics they can cover better than anyone else.
How we compiled this guide
Score bands and methods come from Semrush, Ahrefs, Moz and SE Ranking documentation. The scoring examples are illustrations. Prices come from official pricing pages checked October 30, 2026.
FAQ
What is a good keyword difficulty?
One your site can realistically compete for; new sites often start with keywords under 30.
How is keyword difficulty calculated?
Mostly from the backlinks and authority of the pages already ranking in the top 10.
Why do tools show different KD for the same keyword?
They use different link indexes and formulas.
Should I target keywords with high difficulty?
Later, once your site has authority and supporting content; start with easier, related topics.
Is low keyword difficulty always good?
Not if the keyword brings no value or has almost no searches.
Can I check keyword difficulty for free?
Yes, with limits, in Semrush's free plan, Ahrefs' free keyword tools and Moz's free searches.
Does keyword difficulty change over time?
Yes, as competing pages gain or lose links and as new pages enter the results.
Is keyword difficulty the same as competition in Google Ads?
No. Ads competition measures advertiser bidding; keyword difficulty estimates how hard it is to rank organically.
What difficulty should a new site target?
Usually the lowest bands your tool offers, often under 30 in Semrush, with clear intent and business value.
Can a page rank for a high-difficulty keyword without links?
Occasionally, for very specific intent or fresh topics, but for most competitive terms the pages in the top results have many referring domains. Plan links as part of the strategy.
Sources
Semrush, Ahrefs, Moz and SE Ranking documentation; official pricing pages checked October 30, 2026.