What Is Keyword Difficulty in Semrush: Real Talk

What the KD% Score Actually Measures

Here’s the thing most people skip past — Semrush’s KD% isn’t measuring how “popular” a keyword is. It’s measuring how strong the competition is for that keyword in Google’s top 10 organic results.

The formula draws from several signals:

• Median number of referring domains pointing to the URLs currently ranking — more quality referring domains means harder to displace
• Median ratio of follow to nofollow links — pages with cleaner, stronger follow-link profiles are harder to outrank
• Authority Scores of ranking domains — Semrush’s own 1–100 metric that factors in link power, organic traffic, and spam profile
• Search volume — higher-volume keywords tend to attract more competition, which pushes KD up
• SERP features — if a keyword triggers featured snippets, People Also Ask boxes, or knowledge panels, organic clicks get diluted, which affects how difficult it is to capture meaningful traffic
• Branded vs. non-branded nature of the keyword — brand-dominated SERPs are structurally harder for non-brand sites to break into
• Keyword length (word count) — longer, more specific queries typically carry lower difficulty because they attract less competitive interest

No single factor dominates. It’s a weighted combination that Semrush claims is the most accurate on the market — and in my testing across client projects, it does align better with real-world ranking effort than most alternatives I’ve worked with.

The 6 KD Difficulty Bands — And What They Mean in Practice

Semrush breaks the 0–100 scale into six tiers. On paper, these are clean categories. In practice, they behave differently depending on your domain’s current authority.

One thing competitors don’t spell out clearly enough: these bands aren’t fixed reality — they’re general reality. A domain with an Authority Score of 60+ can realistically target “Difficult” keywords that would be completely out of reach for a new site. This is exactly why Semrush introduced Personal Keyword Difficulty.

Personal Keyword Difficulty (PKD%) — The Part Most Articles Miss

The standard KD% tells you how competitive a keyword is for any website on the internet. Personal Keyword Difficulty (PKD%) tells you how competitive it is specifically for your website.

That distinction matters more than most people realise.

PKD% is calculated based on your domain’s authority relative to the domains currently ranking. A keyword with a KD of 65 might show a PKD of 28 for an established domain with strong topical authority — meaning it’s genuinely achievable for that specific site, even though the general score suggests otherwise.

Semrush surfaces three additional data points alongside PKD:

• Topical Authority — AI-assessed relevance of your domain’s content to the target keyword
• Potential SERP position — where Semrush estimates you could realistically land
• Current position — your existing ranking for that keyword, if any

To see your PKD score, enter your domain in the AI-powered search box inside the Keyword Overview tool. Every variation and related keyword then shows its PKD score alongside the standard KD%.

This is the feature I consistently point to when advising clients who feel discouraged by high general KD scores. In practice, I’ve seen sites with solid topical clusters rank for keywords the general KD score suggested were completely off-limits.

How to Check Keyword Difficulty in Semrush

There are two primary places to find KD data inside Semrush:

Keyword Overview Tool

Enter any keyword directly into Keyword Overview, and you’ll see the KD% prominently displayed alongside volume, intent, CPC, and competitive density. If you’ve added your domain to the AI-powered field, you’ll also see your PKD% for that specific term.

Keyword Magic Tool

This is where KD becomes a research filter, not just an observation. The KD% column appears for every keyword suggestion. You can:

• Sort by KD% to surface easier targets quickly
• Filter by KD range (e.g., only show keywords with KD under 40)
• Add your domain to see PKD% alongside standard KD for each result
• Toggle “Show ranking keywords” to see your current positions in context

A filter combination that works well in practice: set PKD to “Possible” and KD to “Difficult.” This isolates keywords where the general competition is high, but your domain specifically has a realistic shot — hidden opportunities that competitors without PKD access would overlook entirely.

What a Good KD Score Actually Looks Like for Your Site

There’s no universal “good” KD score. That answer depends entirely on where your domain sits right now.

A few practical anchors:

• New or low-authority domains — stay in the 0–29 range initially. Build traffic, earn links, establish topical depth. Fighting for KD 50+ keywords from day one is one of the most common reasons new content strategies stall.
• Mid-authority domains (AS 30–55) — the 30–49 “Possible” range is your productive zone, with selective pushes into 50–69 on topics where you already have established content clusters.
• Established domains (AS 55+) — the 50–69 range becomes realistic territory, and targeted 70+ keywords are worth pursuing where you have genuine topical authority.

The smarter move at any stage is to use PKD as your primary decision filter, and treat general KD as a rough market-temperature reading.

Keywords with search volumes over 100,000 tend to cluster around 76% difficulty or higher. Keywords in the 11–100 monthly search range average around 39% — not because they’re low value, but because they attract less competition. Long-tail keywords in this range often convert at higher rates, too, because searchers know exactly what they want.

The Factors That Move KD Up or Down

Understanding what causes difficulty to shift helps you anticipate it, not just react to it.

Backlink Strength of Current Rankings

The single biggest driver. If the pages ranking for your target keyword have hundreds of referring domains from authoritative sites, Semrush will reflect that in a higher KD. Conversely, if the top 10 is populated by pages with thin backlink profiles — which happens more often than you’d expect in niche topics — the KD can be surprisingly low despite decent search volume.

SERP Feature Saturation

Keywords that trigger multiple SERP features (featured snippets, PAA boxes, image carousels, video panels) push the KD higher — not always because the organic competition is fierce, but because the available organic click share shrinks. You can rank position 3 for a featured snippet keyword and get less traffic than position 1 on a clean SERP. That’s a practical consideration that sits alongside the KD score, not inside it.

Branded Keyword Dynamics

If the keyword contains or is dominated by a brand name, Google prioritises the brand’s own pages structurally. That’s a form of difficulty the KD score partially captures but doesn’t fully explain. Non-brand sites trying to rank for brand-heavy queries face an uphill battle regardless of backlinks.

Long-Tail Specificity

Longer keyword phrases (four-plus words) almost always carry lower KD scores because the universe of competing pages is smaller. This is where content-first strategies can gain ground without needing dominant link authority. The trade-off is lower volume — but often significantly better conversion intent.

Using KD Without Getting Misled By It

A few things the number alone won’t tell you:

KD is backward-looking. It reflects how competitive the current top-10 is. It doesn’t predict how much that will change. Emerging topics can have low KD today and spike dramatically within months as more content enters the space.

KD doesn’t account for content quality gaps. I’ve audited SERPs where the top-ranking pages were genuinely weak — thin content, poor structure, minimal on-page optimisation — despite high KD scores. The difficulty was backlink-driven, not content-driven. That’s a different kind of opportunity than a KD number alone suggests.

KD doesn’t reflect search intent alignment. A keyword can have a KD of 35, but if the SERP intent is mismatched with what you’re creating, you won’t rank regardless. Always check the actual SERP alongside the score.

The KD metric is most useful as a filtering tool in early research, not a final verdict. Once you’ve shortlisted candidates, dig into the actual SERP: who’s ranking, what kind of content they have, and whether there’s a genuine gap.

If you want to explore how Semrush compares to other tools in keyword research depth, the Semrush vs Ahrefs breakdown covers how each tool calculates difficulty differently and what that means for your workflow.

Where to Start If You’re New to KD in Semrush

If you haven’t used Semrush yet, the 7-day free trial gives you full access to both the Keyword Magic Tool and Keyword Overview — enough time to run your seed keywords, pull KD and PKD data, and build an initial keyword list with realistic difficulty targets.

You can start the Semrush free trial here to explore KD% and PKD% for your own domain without committing to a paid plan upfront.

For anyone deciding between plans, the Semrush Pro vs Guru breakdown is worth reading — the keyword research limits differ between tiers in ways that matter for heavier research workloads.

Everything You Need About Semrush Free Trial

Activate your Semrush free trial directly, read our step-by-step guide on how to get it, or learn how to cancel before getting charged — all in one place.