What Is Keyword Difficulty?
Updated 14 September 2026
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Keyword difficulty is a score, usually from 0 to 100, that estimates how hard it is to rank on Google's first page for a keyword. SEO tools like Ahrefs, Semrush, and Moz each calculate it, based mostly on how many other websites link to the pages already ranking. It is each tool's own estimate, not a Google metric, so the same keyword scores differently across tools. Use it to compare targets, not as a promise.
How is keyword difficulty calculated?
Keyword difficulty is calculated differently by each tool, but all of them read the strength of the pages currently ranking. The common thread is links.
Ahrefs's Keyword Difficulty, updated October 2025, scores keywords from 0 to 100 based on the number of referring domains pointing to the top-ranking pages. It deliberately ignores on-page factors.
Semrush uses more inputs. Its Keyword Difficulty percentage blends referring domains, the ratio of followed to nofollowed links, the authority of the ranking domains, and the search features on the page.
Moz takes a third route. It scores difficulty from the Page and Domain Authority of the results on page one. Three tools, three methods, three numbers for the same keyword.
What do the difficulty numbers mean?
The difficulty numbers map to rough bands of effort, though each tool labels them slightly differently. Semrush publishes clear bands.
| Semrush KD% | Meaning |
|---|---|
| 0–14 | Very easy |
| 15–29 | Easy |
| 30–49 | Possible |
| 50–69 | Difficult |
| 70–84 | Hard |
| 85–100 | Very hard |
Source: Semrush Keyword Difficulty documentation, 2026.
Treat the bands as a guide, not a verdict. A score of 40 does not mean a fixed number of months. It means the pages ahead of you are moderately established, and you will need comparable content and links to join them.
Is keyword difficulty a Google ranking factor?
Keyword difficulty is not a Google ranking factor, and Google publishes no such metric. It is a proprietary estimate that SEO tools invented to help you prioritize.
This matters for two reasons. Google never sees or uses these scores, so a low number is not a shortcut it recognizes. And because each tool calculates its own way, you cannot read an Ahrefs 30 and a Semrush 30 as the same thing.
Use difficulty inside one tool, consistently, to rank your options against each other. Do not treat it as an objective truth about the keyword.
How should a small business use keyword difficulty?
A small business should use keyword difficulty to find winnable targets, not to chase the hardest terms. Pair it with two other numbers before deciding.
Check search volume to confirm enough people search the term. Check the search intent to confirm the page you can build matches what searchers want. Then let difficulty tell you whether the competition is beatable now.
New sites should start low. A pattern we see is a young business fixated on the single highest-difficulty term in its market, expecting it within weeks. Those terms are held by sites with years of links and content. Winning a cluster of lower-difficulty long-tail questions first is what makes the hard term reachable later.
Frequently asked questions
What is a good keyword difficulty score to target?
For a new or small site, difficulty scores in the low ranges, roughly under 30 on most tools, are the practical place to start. They signal competition you can realistically beat.
Higher scores are not off-limits forever. As your site earns links and authority, terms that once looked hard become reachable. Start low, then build up.
Why do Ahrefs and Semrush show different difficulty scores?
They use different formulas. Ahrefs looks mainly at referring domains to the top pages, while Semrush blends link counts, link types, domain authority, and search features. Moz uses Page and Domain Authority instead.
Because the inputs differ, the same keyword lands on different numbers. Pick one tool and stay consistent rather than averaging across them.
Is keyword difficulty the same as competition in Keyword Planner?
No. Google Keyword Planner's "competition" column measures advertiser competition for paid ads, not how hard a term is to rank for organically. Keyword difficulty from SEO tools estimates organic ranking difficulty.
They answer different questions. A term can be inexpensive for ads yet hard for organic search, or the reverse.
Can I rank for a high-difficulty keyword?
Yes, but rarely quickly, and rarely as a new site. High-difficulty terms are held by established pages with strong links and deep content. Matching them takes time and a body of related work.
The faster route is to build topical authority on easier related terms first, then reach for the hard one.
Does keyword difficulty matter for AI search?
Partly. AI engines still pull from pages that rank and earn citations, so the competition that difficulty reflects still applies. A term dominated by strong pages is hard to surface in AI answers too.
What changes is the unit. AI search rewards clear, completely answered questions, so difficulty becomes one input alongside how well your page answers the query.
Picking keywords you can actually win
Storming Solutions runs SEO, AEO, and GEO for Malaysian businesses from Kuala Lumpur, and we start every engagement by sorting keywords into winnable and not-yet. We would rather rank you for twenty reachable questions than chase one trophy term you cannot hold.
Not sure which keywords are within reach for your site? Message us on WhatsApp or request the free AI Visibility Report, and we will map your targets by what is actually moving.